3 letters:
a's, a.s, j's, k's, res

4 letters:
a.'s, bays, baze, da's, dais, dase, days, daze, faze, fe's, gase, gays, gaze, hase, hays, haze, heys, iras, j.'s, jays, k.'s, kase, kays, lais, lase, lays, leis, leys, maes, mase, mays, maze, mj's, nase, nays, oles, pais, paiz, pays, pj's, rase, rays, raze, re's, sais, saiz, tays, wais, ways, yeas

5 letters:
-ways, adays, adres, agaze, amaze, aways, b-j's, baise, baize, bay's, bayes, bayse, blase, blaze, braes, brase, brays, braze, c.a.s, cafes, caise, cayes, cepes, che's, claes, clase, clays, crase, crays, craze, daise, day's, days', dnase, drays, dreys, f.a.s, fay's, flays, fraes, frase, frays, fraze, glase, glaze, grays, graze, greys, hayes, hayse, inaez, ira's, jae's, jahaz, jay's, jay-z, kay's, kayes, klase, lay's, mae's, maise, maize, may's, mayes, mays', mayse, mores, obeys, ofays, okays, omaze, paise, payse, pei's, phase, phaze, plase, plays, prase, prays, preys, raise, ray's, rayes, rea's, reyse, rnase, shays, skase, slays, smase, smaze, spays, stays, sways, taizz, trays, treys, ukase, waise, way's, xrays

6 letters:
ablaze, abrase, acrase, acraze, adpase, aiways, allays, always, araise, arrays, assays, atpase, belays, bemaze, berets, blaese, blaise, blaize, blayze, braies, braise, braize, byways, caches, chaise, chayes, claeys, clayes, cray's, decays, delays, dnaase, ebay's, embays, envase, essays, faye's, filets, fraise, frey's, gray's, grey's, gtpase, gyrase, inlays, jose's, kinase, lamaze, liaise, ligase, lipase, madres, malays, melees, monets, morays, mutase, n-ways, neighs, nm ase, noways, onlays, padres, phrase, plaise, play's, ppiase, praise, purees, relays, repays, satays, shea's, shlaes, slay-z, sobeys, splays, sprays, strays, swayze, todays, tokays, unsays, untaes, upgaze, valets, weighs, x-rays

7 letters:
acylase, affrays, airways, amidase, amylase, anyways, apyrase, ballets, benet's, betrays, bewrays, biphase, buffets, busways, cathays, chalaze, chalets, chymase, cimaise, cliches, conveys, conways, coquets, cyclase, deejays, defrays, deglaze, dephase, diapase, diphase, dismays, dornase, elway's, emblaze, emigres, endways, enolase, entrees, estrays, fadaise, falaise, flonase, flyways, fridays, fuentes, fuentez, gymnase, heydays, hoorays, hydrase, icp-aes, imblaze, inphase, inulase, jetways, keyways, kioways, landais, lescaze, m.a.s.h, malaise, middays, midways, mislays, mizmaze, mondays, monet's, omakase, orfrays, orinase, outgaze, outlays, outraze, oxidase, paydays, piolets, prepays, primase, pronase, punaise, purveys, reglaze, replays, reraise, resumes, rochets, roget's, roquets, runways, sashays, seaways, seprase, skyways, sleighs, soirees, sorbets, subways, sucrase, sundaes, sundays, sunrays, surveys, tannase, today's, toupees, unidays, upraise, warfaze, waylays

8 letters:
activase, afsane's, airway's, airways', aldolase, anaphase, anglaise, appraise, archaise, archaize, archways, areaways, arginase, ashtrays, awaydays, aye-ayes, ballet's, bar-kays, barnaise, beltways, bepraise, bikeways, bluejays, bobstays, bombay's, bosquets, bouquets, bouviers, briquets, cabarets, caraways, cashways, catalase, ceredase, chiclets, circlets, colipase, crochets, croquets, curtseys, cutaways, cutinase, delhaize, deshaies, deshayes, dextrase, disobeys, displays, disseize, dog-days, dog days, doorways, dossiers, duarte's, edgeways, epaphras, esterase, f-atpase, fairways, faradays, filmways, fishways, flatways, flyaways, folkways, foodways, footways, freeways, friday's, fumarase, gainsays, gangways, gateways, gervaise, getaways, gourmets, hallways, headways, hebraise, hebraize, helicase, highways, holidays, hyundais, idocrase, in-phase, indosuez, inveighs, invirase, jouret's, kokate's, lachaise, layaways, lifeways, longways, lyonnais, maltaise, matinees, mauvaise, midway's, misplays, misraise, monday's, nikkei's, norway's, nosegays, nowadays, nuclease, ojibways, outplays, outstays, overgaze, overlays, overpays, pancrase, parfaits, parkways, parquets, pathways, permease, piaget's, picquets, playdays, pomfrets, portrays, prophase, protease, proteges, pyramaze, racemase, raceways, railways, rephrase, roadways, runaways, shipways, shoegaze, sickbays, sideways, slipways, someways, souffles, stargaze, sundae's, sunday's, survey's, taipei's, taxiways, theblaze, thiolase, thruways, togidres, tolinase, tollways, tramways, triphase, tuesdays, unpraise, v-atpase, walkways, washdays, weekdays, workdays, workways, zea mays

9 letters:
accuphase, accuray's, acetylase, alleyways, alliinase, alteplase, anchorets, anhydrase, backblaze, backstays, bannerets, bearnaise, bioassays, birthdays, blackgaze, bob hayes, brinolase, cabernets, cableways, carburets, castaways, causeways, cellarets, cellulase, chitinase, clearways, coagulase, coastways, colorways, compadres, compusa's, conjugase, crossways, dehydrase, desmolase, dismutase, dispraise, downplays, driveways, ecossaise, entryways, epimerase, faraday's, fazerdaze, fibrinase, floridays, flowerets, forestays, fortovase, fournaise, frustules, fundraise, galloways, gateway's, giveaways, greenways, grindlays, guimaraes, hatchways, hedgemaze, hideaways, highway's, histidase, holiday's, hydrolase, hyundai's, i. r. a.s, integrase, interfase, irlandais, isomerase, jaffray's, karachays, kootenays, lactonase, leastways, ligninase, lyonnaise, mainstays, mangabeys, mayonaise, mcveigh's, mesophase, metaldays, metaphase, methylase, micronase, mispraise, monophase, motorways, myokinase, newsday's, objibways, otherways, outweighs, overglaze, overgraze, overplays, overstays, oxygenase, pectinase, peptidase, phenolase, pipeclays, polonaise, polyphase, popinjays, prolidase, railway's, replicase, reptilase, resurveys, reteplase, ricochets, rockaways, safeway's, shapeways, sialidase, slantways, slideways, sollerets, soothsays, speedways, spillways, spondaise, spondaize, stairways, stingrays, stowaways, sublimaze, takeaways, tearaways, teleplays, telophase, thenadays, touvier's, trailways, trehalase, tuesday's, two-phase, underlays, underpays, urocanase, urokinase, uruguay's, usairways, walkaways, waterways, widthways

10 letters:
abbokinase, anal phase, antillaise, bobsleighs, bordelaise, breakaways, breezeways, bridleways, broadway's, brockway's, c. i. a.'s, cabriolets, callaway's, carotenase, ceramidase, chevrolets, chippeways, chloronase, colourways, cornerways, creatinase, cross-days, cybercafes, delosreyes, demi-glaze, desaturase, dextranase, dextrinase, diaphorase, dijonnaise, diplophase, don swayze, early days, f. d. a.'s, finlandais, fucosidase, fund-raise, gamma-rays, gelatinase, glyoxalase, hairsprays, haplophase, hathaway's, hexokinase, hollandais, holliday's, holophrase, i. r. a.'s, insulinase, interphase, interplays, isoamylase, kubernetes, leaseway's, lengthways, lipoxidase, luciferase, mayonnaise, metaphrase, microblaze, milo maize, multiphase, muramidase, myrosinase, n. r. a.'s, oral phase, overpraise, overweighs, p.u.n.k.s., paraphrase, passphrase, periphrase, peroxidase, photolyase, pinochet's, portugaise, proteinase, pyocyanase, reappraise, redisseize, role-plays, roundelays, saccharase, santa-fe's, schooldays, set ablaze, set phrase, sobriquets, spinnerets, steinway's, stowaway's, swimmerets, swordplays, telomerase, thiaminase, thiokinase, throwaways, thursday's, trailways', traveldays, tyrosinase, underglaze, underplays, wednesdays, yesterdays

11 letters:
aliesterase, andrew gaze, biotinidase, breadthways, carboxylase, carnosinase, catchphrase, check-raise, chevrolet's, chrysoprase, collagenase, communiques, de-iodinase, demethylase, dioxygenase, dipeptidase, exonuclease, expressways, flint maize, formamidase, freightways, glucokinase, glucosidase, glycogenase, glycosidase, hemingway's, histaminase, hollandaise, hostel daze, hydrogenase, hydroxylase, in two ways, kelly claes, lecithinase, luna blaise, mannosidase, microarrays, nattokinase, nitrogenase, noun phrase, passageways, post-chaise, post chaise, recombinase, screenplays, self-praise, soubriquets, strangwayes, superpraise, three-phase, throughways, underpraise, verb phrase, wednesday's, white-blaze, yesterday's

12 letters:
allantoinase, aminopherase, asparaginase, beta-amylase, carbohydrase, carriageways, catch-phrase, creatininase, dorian yates, double-glaze, enterokinase, entranceways, exopeptidase, fructokinase, glucoamylase, immunoassays, jet2holidays, kininogenase, kynureninase, lipoxygenase, marseillaise, nucleotidase, pancrelipase, prometaphase, pseudokinase, single-phase, speculators', straightways, the runaways, velagrande's

13 letters:
a-glucosidase, alpha-amylase, aspartokinase, cocarboxylase, commerciale's, companionways, cystathionase, decarboxylase, dehydrogenase, endopeptidase, galactokinase, galactosidase, genital phase, glucuronidase, hyaluronidase, latency phase, monooxygenase, neuraminidase, penicillinase, phosphokinase, phospholipase, phosphorylase, qatar airways, quarter-phase, straightaways, streptokinase, superhighways, thrombokinase, topoisomerase, transaldolase, transketolase, tryptophanase

14 letters:
acetylesterase, amidohydrolase, aminopeptidase, beta-lactamase, chlorophyllase, cholinesterase, cyclooxygenase, disaccharidase, etihad airways, hexosaminidase, l-asparaginase, l-fuculokinase, melodic phrase, mini motorways, musical phrase, pectinesterase, phosphoamidase, prothrombinase, ribonucleinase, schweitzerkase, staphylokinase, streptodornase, tampa bay rays, transacetylase, transpeptidase

15 letters:
arylformamidase, bullinamingvase, cyclo-oxygenase, enteropeptidase, lactoperoxidase, menstrual phase, myeloperoxidase

16 letters:
amyloglucosidase, beta-glucosidase, carboxypeptidase, green mayonnaise, immunoperoxidase, month of sundays, sphingomyelinase, transglycosylase, transhydrogenase

17 letters:
alpha-glucosidase, alpha-mannosidase, dehydrochlorinase, lysophospholipase, metalloproteinase, one of these days, phosphodiesterase, polygalacturonase, radioimmunoassays, serratiopeptidase, the good old days, toronto blue jays

18 letters:
all nippon airways, anticholinesterase, beta-galactosidase, beta-glucuronidase, glucocerebrosidase, phosphoglucomutase, russian mayonnaise, walton-on-the-naze

19 letters:
alpha-galactosidase, alpha-l-iduronidase, phosphofructokinase, phosphomonoesterase, procarboxypeptidase, rutherford b. hayes, shakespeare's plays, the next three days

20 letters:
acetylcholinesterase, galactosylceramidase, pseudocholinesterase

21 letters:
butyrylcholinesterase

23 letters:
beta-fructofuranosidase

25 letters:
rutherford birchard hayes

27 letters:
2021 world athletics relays

5 letters:
rates, bates, gates, waits, fates, dates, mates

6 letters:
skates, plates, states

7 letters:
straits, weights

13 letters:
united states

20 letters:
william butler yeats

22 letters:
war between the states

31 letters:
organization of american states

34 letters:
commonwealth of independent states