3 letters:
ate, est

4 letters:
bait, bate, cate, date, fait, fate, fete, gait, gate, hate, kate, late, mate, pate, rate, sate, tait, tate, wait

5 letters:
abate, await, blate, chait, crate, eight, elate, enate, grate, great, irate, krait, plait, plate, prate, skate, slate, spate, state, trait, waite

6 letters:
ablate, acuate, agnate, berate, borate, cerate, create, debate, derate, dilate, donate, eluate, equate, estate, fixate, gyrate, hamate, ideate, id est, inmate, innate, iodate, ionate, irrate, jugate, kuwait, locate, luxate, mutate, negate, notate, oblate, ornate, pupate, rebate, relate, rotate, sedate, strait, uniate, update, weight

7 letters:
acerate, acetate, actuate, adulate, agitate, animate, arcuate, au fait, biaxate, bromate, bullate, caseate, cholate, cirrate, citrate, cognate, collate, connate, cordate, costate, cuneate, cuspate, cyanate, deflate, deviate, dictate, educate, elevate, emanate, emirate, emulate, epilate, expiate, fellate, ferrate, filiate, foliate, foveate, freight, furcate, gemmate, gestate, hastate, hydrate, imavate, imitate, inflate, ingrate, instate, isolate, iterate, l-plate, librate, liquate, magnate, mandate, margate, mediate, migrate, muriate, narrate, neonate, nitrate, obovate, obviate, of late, operate, or gate, overate, oxalate, oxidate, peltate, pennate, picrate, plicate, predate, primate, probate, prolate, pronate, prorate, pulsate, quinate, radiate, reflate, restate, saltate, satiate, scutate, sensate, serrate, situate, striate, sulcate, sulfate, summate, tannate, testate, thwaite, titrate, to date, ululate, uncrate, upstate, urinate, valuate, virgate, vitiate

8 letters:
abdicate, aberrate, ablegate, abnegate, abrogate, acaudate, acerbate, activate, adequate, advocate, aguacate, alginate, alienate, allocate, allstate, amputate, and gate, angulate, annotate, annulate, antedate, areolate, arillate, aristate, arrogate, asperate, aspirate, automate, backdate, baldpate, biforate, bijugate, bloviate, bunkmate, campmate, capitate, carafate, carinate, carucate, casemate, castrate, catenate, chordate, chromate, clypeate, cogitate, conflate, copulate, corelate, craniate, crispate, cristate, crowbait, cruciate, cumulate, cupulate, cut-rate, cut rate, decimate, decorate, dedicate, delegate, desolate, detonate, digitate, distrait, dominate, due date, ecaudate, echinate, edentate, emaciate, emigrate, enervate, eradiate, escalate, estimate, estivate, evacuate, evaluate, excavate, exuviate, federate, filtrate, flatmate, foredate, fumigate, geminate, generate, glabrate, glaciate, gladiate, graduate, hebetate, helpmate, hesitate, hotplate, immolate, incubate, indagate, indicate, initiate, innovate, insolate, insulate, intimate, intonate, inundate, invocate, irrigate, irritate, jailbait, jubilate, jugulate, lacerate, laminate, lapidate, latinate, levigate, levirate, levitate, liberate, lichgate, ligulate, litigate, lustrate, lychgate, macerate, marinate, medicate, meditate, messmate, militate, misstate, mitigate, moderate, motivate, muricate, mutilate, nauseate, navigate, nominate, not late, nucleate, numerate, obligate, oppilate, overrate, paginate, patinate, pay rate, peculate, permeate, perorate, playmate, populate, postdate, priorate, prostate, punctate, racemate, recreate, regulate, relegate, renovate, resinate, resonate, roommate, ruminate, runagate, salinate, salivate, saturate, separate, shipmate, sibilate, silicate, simulate, spoliate, squamate, stagnate, stellate, straight, sulphate, suricate, tabulate, tailgate, tax rate, teammate, thoriate, titanate, titivate, tolerate, tollgate, truncate, tubulate, ulcerate, umbonate, undulate, ungulate, urticate, ustulate, vegetate, venerate, workmate

9 letters:
acclimate, acidulate, acuminate, adumbrate, aestivate, affiliate, aggravate, alleviate, altercate, alternate, antiquate, appellate, applicate, arbitrate, associate, astrogate, attenuate, backplate, bank rate, baud rate, bay state, bicornate, bidentate, bifurcate, bipennate, bipinnate, birthrate, biserrate, bisulcate, bisulfate, biteplate, bombilate, bookplate, calculate, calibrate, caliphate, capsulate, captivate, carbamate, carbonate, castigate, celebrate, cerebrate, checkmate, cingulate, circulate, classmate, clathrate, coagulate, colligate, collimate, commutate, conjugate, cooperate, correlate, corrugate, corticate, coruscate, crenelate, crenulate, crepitate, cucullate, culminate, cultivate, cuspidate, cyclamate, data rate, deaminate, deathrate, decollate, decussate, defalcate, delineate, demarcate, denigrate, deprecate, depredate, desecrate, designate, despumate, devaluate, devastate, dimidiate, diplomate, dissipate, dolabrate, doorplate, dose rate, duck pate, dulcorate, duplicate, ejaculate, elaborate, eliminate, elucidate, elutriate, embrocate, enucleate, enumerate, enunciate, eradicate, evaporate, excoriate, exonerate, expatiate, expiscate, explicate, extenuate, extirpate, extricate, fabricate, faceplate, fascinate, faveolate, fecundate, fimbriate, fishplate, fistulate, floodgate, flow rate, fluctuate, flyweight, foliolate, footplate, forcipate, formulate, fornicate, frustrate, fulminate, fustigate, gem state, germinate, glutamate, goldplate, granulate, gratulate, gravitate, habituate, head gate, hibernate, hot plate, housemate, humiliate, hyphenate, ice skate, imbricate, immigrate, impetrate, implicate, imprecate, incarnate, inculcate, inebriate, infatuate, infuriate, infuscate, innervate, inoculate, insatiate, instigate, integrate, intestate, irradiate, jactitate, laciniate, lamellate, legislate, lingulate, liquidate, lithonate, lixiviate, lock-gate, lubricate, lucubrate, machinate, manducate, manganate, masticate, meliorate, miltomate, miscreate, molybdate, mucronate, mussitate, nameplate, negociate, negotiate, nictitate, noviciate, novitiate, obcordate, obfuscate, objurgate, obsecrate, obumbrate, officiate, originate, oscillate, overstate, oxygenate, palmitate, papillate, pectinate, penetrate, percolate, perennate, perforate, personate, phenolate, pollinate, poor rate, postulate, potentate, predicate, procreate, propagate, pullulate, pulmonate, pulvinate, punctuate, pustulate, rabbinate, rain date, re-create, reinstate, reiterate, remediate, replicate, repudiate, retaliate, rubricate, rusticate, segregate, serrulate, soleplate, solmizate, soul mate, spatulate, speculate, sporulate, stalemate, stimulate, stipitate, stipulate, subjugate, subrogate, substrate, suffocate, sulfonate, surrogate, suscitate, syncopate, syndicate, tablemate, tail gate, terminate, tesselate, tin plate, titillate, tittivate, translate, tungstate, turbinate, umbellate, underrate, urceolate, vacillate, ventilate, watergate, whitebait

10 letters:
abbreviate, abirritate, accelerate, accumulate, adjudicate, adulterate, amalgamate, ameliorate, annihilate, anticipate, apostolate, appreciate, articulate, asphyxiate, assibilate, assimilate, auscultate, barbellate, bichromate, bicornuate, biloculate, birth rate, bitartrate, blind date, cachinnate, calceolate, calumniate, calyculate, cancellate, cantillate, capacitate, capreolate, catenulate, chalybeate, cheapskate, chlorinate, city-state, city state, clofibrate, commentate, compensate, complicate, conciliate, condensate, confiscate, congregate, consecrate, constipate, consummate, coordinate, crenellate, crime rate, deactivate, debilitate, decapitate, decelerate, deflagrate, degenerate, delaminate, delapidate, deliberate, delimitate, demodulate, denominate, depopulate, depreciate, desalinate, desquamate, detoxicate, dichromate, dilapidate, dinocerate, dissertate, distillate, echinulate, edentulate, edulcorate, effectuate, emancipate, emasculate, episcopate, equivocate, eviscerate, exacerbate, exaggerate, exasperate, excogitate, excruciate, exhilarate, expatriate, facilitate, felicitate, fenestrate, fibrillate, first-rate, first mate, flabellate, flagellate, flocculate, fluoridate, free state, geniculate, gold plate, gray skate, guestimate, habilitate, heart rate, home plate, homogenate, homologate, illustrate, impregnate, inactivate, inadequate, incinerate, incrassate, infiltrate, ingeminate, ingratiate, innoculate, inseminate, insufflate, intenerate, interstate, intimidate, intoxicate, intrastate, invalidate, invigilate, isocyanate, italianate, lanceolate, lemniscate, licentiate, magistrate, makeweight, mammillate, manipulate, , menstruate, mithridate, net estate, nidificate, obliterate, obnubilate, orbiculate, overweight, paniculate, patriciate, pediculate, perpetrate, perpetuate, pistillate, potentiate, preisolate, profligate, propitiate, reactivate, recidivate, recuperate, redecorate, rededicate, reevaluate, regenerate, rejuvenate, remunerate, repatriate, saccharate, schoolmate, sleep late, sluicegate, soup plate, spathulate, sphacelate, stablemate, stridulate, sucralfate, supplicate, terneplate, tessellate, third-rate, travelgate, triacetate, tridentate, trifurcate, tripinnate, trisulcate, understate, uninitiate, up-to-date, vertebrate, vesiculate, wall plate, water-rate, water gate

11 letters:
accommodate, agglomerate, agglutinate, alendronate, aloha state, appropriate, approximate, armor plate, assassinate, assibiliate, at any rate, averruncate, beneficiate, bicuspidate, bifoliolate, body weight, boilerplate, bracteolate, breastplate, cardinalate, carunculate, chelicerate, clean slate, collaborate, commemorate, commiserate, communicate, concatenate, concentrate, confabulate, confederate, consolidate, constellate, contaminate, contemplate, copperplate, corniculate, corroborate, cover plate, de-escalate, decarbonate, decerebrate, decorticate, decrepitate, deglutinate, demonstrate, deoxygenate, depauperate, desegregate, deteriorate, determinate, discalceate, disseminate, dissimilate, dissimulate, domesticate, domiciliate, double-date, encapsulate, equilibrate, expostulate, expropriate, exstipulate, exterminate, extrapolate, extravasate, fasciculate, first state, golden gate, ground bait, growth rate, heavyweight, hydrogenate, hydrolysate, hypothecate, imperforate, impersonate, incarcerate, incorporate, incriminate, induplicate, ingurgitate, instantiate, interpolate, interrelate, interrogate, investigate, lie in wait, life estate, lightweight, lose weight, meprobamate, merthiolate, miscegenate, monohydrate, necessitate, numberplate, ocean state, odd-pinnate, orchestrate, out-of-date, oxalacetate, paperweight, participate, peach state, pedicellate, pedunculate, pennyweight, polysorbate, pontificate, precipitate, predominate, premeditate, proliferate, real estate, recalculate, reciprocate, recriminate, reduplicate, reformulate, refrigerate, regurgitate, reincarnate, reintegrate, remonstrate, renegotiate, rent-rebate, resuscitate, retranslate, rider plate, salad plate, sash weight, second-rate, sequestrate, silverplate, slave state, solid-state, steel plate, strangulate, subordinate, superfetate, syllabicate, thiocyanate, thiosulfate, totipalmate, triangulate, troy weight, tuberculate, underweight, urochordate, wicket gate

12 letters:
absquatulate, administrate, archegoniate, armour plate, authenticate, badger state, balkan state, baltic state, bantamweight, bargain rate, beaver state, biflagellate, billingsgate, borosilicate, buffer state, carbohydrate, change state, charge plate, chinese date, church-state, companionate, concelebrate, conduplicate, conglutinate, congratulate, coyote state, deconsecrate, defenestrate, defibrillate, dinner plate, disambiguate, disconsolate, discriminate, disincarnate, disintegrate, disorientate, electroplate, empire state, even-pinnate, extortionate, figure eight, figure skate, finger plate, first estate, fluosilicate, freight rate, garden state, golden state, gopher state, gross estate, incapacitate, indoctrinate, invertebrate, korea strait, lead acetate, lime hydrate, line of fate, little skate, mental state, methotrexate, middleweight, miscalculate, mistranslate, mormon state, nation-state, nutmeg state, oblanceolate, overestimate, oxaloacetate, payment rate, permanganate, police state, prefabricate, recalcitrate, recapitulate, reconsecrate, redintegrate, rehabilitate, reinvigorate, roller skate, running mate, scrobiculate, silver plate, silver state, sooner state, sophisticate, subalternate, substantiate, supererogate, third estate, thirty-eight, thorny skate, throw-weight, transmigrate, trifoliolate, twenty-eight, unregenerate, vacancy rate, verticillate, welterweight, zinc sulfate

13 letters:
absentee rate, atomic weight, beehive state, bering strait, buckeye state, circumvallate, counterweight, cruiserweight, deconcentrate, decontaminate, dehydrogenate, dessert plate, diamond state, differentiate, discount rate, dissassociate, ethyl acetate, exchange rate, excommunicate, fashion plate, featherweight, fourth estate, granite state, hawkeye state, head of state, hoosier state, hundredweight, insubordinate, interest rate, korean strait, landed estate, license plate, lying in wait, maturity date, meclofenamate, multinucleate, natural state, overcultivate, pelican state, polycarbonate, prairie state, procrastinate, prognosticate, public debate, quadruplicate, quarter plate, second estate, section eight, seventy-eight, show me state, sparring mate, starting gate, supersaturate, turnover rate, underestimate, welfare state, zinc sulphate, zooflagellate

14 letters:
american state, attrition rate, chief of state, chromium-plate, circumnavigate, contraindicate, copper sulfate, dimenhydrinate, dinoflagellate, ecstatic state, equality state, excursion rate, fertility rate, hemagglutinate, hyperventilate, inflation rate, interpenetrate, isothiocyanate, keystone state, lead carbonate, magnolia state, metabolic rate, misappropriate, mortality rate, mountain state, new york state, occupancy rate, old line state, overcompensate, palmetto state, piece of eight, re-incorporate, repayment rate, sandwich plate, silver nitrate, sodium nitrate, spin the plate, sunshine state, tar heel state, threshold gate, tintinnabulate, treasure state

15 letters:
barium sulphate, bluegrass state, calcium hydrate, calcium nitrate, cephalochordate, change of state, circumstantiate, cognitive state, consubstantiate, copper sulphate, cross-pollinate, emotional state, evergreen state, figure of eight, herod the great, louis the great, methylphenidate, old north state, personal estate, pine tree state, sagebrush state, sodium sulphate, sunflower state, telecommunicate, temporary state, volunteer state, wolverine state

16 letters:
abruptly-pinnate, ammonium nitrate, at an equal rate, australian state, calcium sulphate, centennial state, collection plate, combining weight, installment rate, intercommunicate, irish free state, molecular weight, north star state, pompey the great, reporting weight, sodium carbonate, transubstantiate, walking delegate

17 letters:
atmospheric state, battle born state, calcium carbonate, capital of kuwait, cellulose acetate, cellulose nitrate, charles the great, depreciation rate, equivalent weight, exercising weight, great lakes state, gregory the great, light heavyweight, lithium carbonate, magnesium sulfate, mercury fulminate, polyvinyl acetate, potassium nitrate, sodium dichromate, unemployment rate

18 letters:
ammonium carbonate, aquatic vertebrate, constitution state, even-toed ungulate, grand canyon state, hydrogen carbonate, junior lightweight, long hundredweight, old dominion state, peace garden state, photographic plate, secretary of state, sedimentation rate, tomato concentrate

19 letters:
alexander the great, catherine the great, department of state, frederick the great, junior middleweight, junior welterweight, physiological state, potassium carbonate, prime interest rate, psychological state, short hundredweight

20 letters:
amphetamine sulphate, basal metabolic rate, green mountain state, junior featherweight, metric hundredweight, mount rushmore state, plantlike flagellate, potassium dichromate, sailor's breastplate

21 letters:
alkylbenzenesulfonate, infant mortality rate, mithridates the great

28 letters:
kiss-me-over-the-garden-gate