2 letters:
am

3 letters:
bam, cam, dam, ham, jam, kam, lam, mme, nam, pam, ram, sam, tam, yam

4 letters:
alam, bahm, bram, camm, cham, clam, cram, dahm, damm, damn, dram, exam, flam, fram, gahm, gamm, gram, hahm, hamm, i am, jamb, kamm, kram, kvam, lahm, lamb, lamm, nahm, pham, plam, pram, rahm, ramm, sahm, scam, sham, siam, slam, spam, sram, stam, swam, tamm, tham, tram, wham, zahm

5 letters:
-gram, abcam, abram, agram, akram, appam, aramm, arcam, asram, atpam, c-ram, cdram, cgram, coram, cramm, d-ram, dambe, damme, ddram, edram, exame, flamb, flamm, frahm, gamme, gramm, hamme, id.me, ihram, ikram, jambe, klamm, kramm, kstam, lambe, lamhe, lamme, ma'am, mapam, mcham, mdram, modam, nicam, occam, ogram, osram, oxfam, panam, potam, priam, psram, raham, ramme, rdram, rexam, samme, savam, scham, scram, sdram, sgram, shram, slamm, spamm, spram, stamm, stram, t-lam, undam, whame, xdcam, yotam, ziram

6 letters:
88glam, alabam, amdram, ashram, avaram, bagram, bahram, bedamn, bikram, contam, corfam, crambe, digram, diiamb, dirlam, drdram, durham, dvdram, ele.me, engram, excamb, figjam, flambe, flamme, goddam, gojjam, graeme, graham, gramme, jimjam, kramme, kvamme, laflam, logjam, madame, mahram, makram, maryam, mcclam, mclamb, mirjam, n-gram, nitram, nwoahm, outram, pancam, pegram, quamme, reclam, reexam, rldram, schram, scramb, sharam, shibam, skycam, sutram, tc-pam, ugramm, vandam, wagram, webcam

7 letters:
aashram, abnahme, abraham, am-dram, anagram, anandam, bartram, beacham, beckham, beltram, buckram, burcham, buttram, centram, chakram, chitram, dataram, ddr-ram, diagram, dvd-ram, dzrb-am, emagram, epigram, exagram, grandam, grogram, guntram, harambe, hebamme, holidam, inghram, isogram, jagadam, jayaram, kedaram, khayyam, kingham, layanam, lifecam, lockram, lyskamm, mastram, mataram, milgram, myogram, pangram, potsdam, program, racetam, ramatam, rimapam, roudram, schlamm, schramm, sicovam, sigaram, souryam, syntagm, t-55agm, tai dam, tam-tam, td nlam, tevaram, thukdam, trigram, urogram, utharam, uttapam, vedalam, wareham, web-cam, westbam, whitlam, wingdam, wolfram

8 letters:
about.me, adoniram, aerogram, ahobilam, al-ahram, al-an'am, ambigram, amersham, anagramm, antigram, antispam, arrambam, ausnahme, autogram, baa-lamb, bandicam, barogram, barthram, bologram, callaham, can-spam, cataflam, caterham, chithram, choliamb, choriamb, dagenham, datagram, decagram, decigram, diagramm, diaphram, diazepam, doorjamb, dygogram, echogram, ethogram, flimflam, fluidram, friedsam, genogram, gigagram, granddam, gurugram, hemogram, hexagram, high dam, hologram, hypercam, ideogram, idiogram, infogram, ingraham, ionogram, kilogram, kshetram, kymogram, lavenham, lexigram, lipogram, logogram, mailgram, mamogram, marigram, megagram, minnaram, mistajam, monogram, multicam, nattramn, nonagram, nonogram, octagram, ondogram, oxazepam, paragram, petagram, picogram, polygram, poomaram, prazepam, programm, puttalam, quazepam, red gram, renogram, sandhamn, sciagram, shoreham, silambam, skiagram, sonagram, sonogram, startram, swaffham, swagatam, tambaram, telegram, teragram, trangram, tungsram, vandamme, venogram, viet nam, volendam, wild yam, wolfgram, xerogram, yeongnam, zymogram

9 letters:
al-akhdam, allingham, amsterdam, anagramme, anantaram, anemogram, anti-spam, archigram, autogramm, beaverdam, beckenham, blakenham, blanagram, cablegram, calligram, candygram, capnogram, centigram, cladogram, cockerham, cofferdam, coquitlam, cystogram, c program, ddr-sdram, diagramme, diaphragm, diskogram, dithyramb, ellingham, enneagram, epiphragm, faversham, flim-flam, gandeevam, gooderham, habersham, haemogram, halazepam, heptagram, hierogram, histogram, hygrogram, ichnogram, idiyappam, immingham, instagram, karlshamn, karyogram, kilogramm, kissagram, kissogram, laningham, limberham, lorazepam, lou gramm, malayalam, mammogram, mariehamn, masterjam, medazepam, medmenham, metergram, microgram, middleham, milligram, moneygram, myelogram, myriagram, nastygram, nephogram, neurogram, newingham, oral exam, pavithram, pentagram, petersham, phonogram, photogram, programme, pyelogram, rampampam, reprogram, rotterdam, sambandam, samrajyam, scalogram, shaligram, sialogram, spidercam, spirogram, spring.me, sringaram, stringham, tachogram, temazepam, tephigram, tetragram, tirusulam, tofisopam, tottenham, tremogram, uncle sam, videogram, voicegram, water yam, westerdam, westerham, whim-wham, white yam, wickerham, wilbraham, withernam, wokingham, yottagram, zolazepam

10 letters:
.amsterdam, aerogramme, arthrogram, bellingham, billingham, birmingham, blood clam, bombingham, bromazepam, buckingham, burlingham, burningham, cardiogram, chronogram, clonazepam, cottingham, crittercam, cunningham, ddr3 sdram, ddr4 sdram, ddr5 sdram, decagramme, decigramme, dendrogram, diaphragme, diclazepam, dillingham, dithyrambe, esophagram, everingham, fillingham, final exam, fluid dram, flurazepam, framingham, giant clam, gillingham, grand slam, green gram, hamsterdam, hologramme, hoover dam, horse gram, kaldur'ahm, kilogramme, landingham, leadingham, lettergram, lymphogram, mottingham, nephrogram, nitrazepam, nordazepam, nottingham, novo-dipam, organigram, phenazepam, phlebogram, picnic ham, preprogram, psychogram, rastergram, razor clam, roast lamb, rockingham, round clam, scintigram, seismogram, sheringham, shrivenham, small slam, sphenogram, spidergram, staurogram, stereogram, steve cram, strusshamn, subprogram, swammerdam, tarmacadam, thaandavam, thermogram, tv program, twickenham, ulricehamn, urumattram, viluppuram, walsingham, wickersham, willingham, winningham

11 letters:
aayushkalam, antibiogram, arithmogram, audiogramme, bronchogram, centigramme, cephalogram, chinese yam, christogram, coniogramme, correlogram, cut of lamb, dactylogram, dasapushpam, delorazepam, electrogram, framlingham, frothingham, give a damn, golden gram, hectogramme, histogramme, hysterogram, leg of lamb, little slam, marconigram, metaprogram, microgramme, milligramme, myriagramme, nimetazepam, oscillogram, park so-dam, pugaippadam, scattergram, shubharambh, spectrogram, sphygmogram, syllabogram, tax program, traffic jam, twicetagram, whittingham

12 letters:
apo-diazepam, elephant yam, flow diagram, godzillagram, heiligendamm, john abraham, lisp program, loin of lamb, lormetazepam, madanolsavam, maha-sangram, mahasamudram, medical exam, megasandesam, microprogram, midterm exam, news program, oddanchatram, organigramme, paschal lamb, persian lamb, pms-diazepam, quiz program, rack of lamb, rajamanikyam, rangasthalam, richard lamm, sort program, steamer clam, tinker's dam, tree diagram, vanlaningham, virginia ham, vishwaroopam

13 letters:
anandabhadram, aries the ram, battering-ram, battering ram, block diagram, chandrolsavam, encephalogram, flunitrazepam, hemidiaphragm, hydraulic ram, input program, interferogram, logic diagram, meghasandesam, parallelogram, pilot program, plethysmogram, polysomnogram, radiotelegram, roentgenogram, scythian lamb, space program, tammy abraham, tinker's damn, trace program, ultrasonogram, vallandingham, vanlandingham, water program, works program

14 letters:
apollo program, autostereogram, breast of lamb, cholecystogram, cystometrogram, degree program, echocardiogram, editor program, electromyogram, gemini program, hindenburgdamm, iris diaphragm, object program, output program, parallelogramm, saddle of lamb, silappatikaram, source program, stored-program, strawberry jam, system program, target program, yuvajanotsavam

15 letters:
angiocardiogram, artemis program, cade cunningham, defence program, defense program, distributor cam, freshwater clam, geetha govindam, judeo-malayalam, letter telegram, liam cunningham, library program, logical diagram, mare winningham, mercury program, monitor program, phonocardiogram, photofluorogram, pump up the jam, radiocardiogram, reading program, service program, sorting program, systems program, utility program

16 letters:
academic program, assembly program, bosom of abraham, checking program, cherrystone clam, computer program, cystourethrogram, electrooculogram, electropherogram, emily wickersham, orton-gillingham, preliminary exam, reusable program, snapshot program, training program, vectorcardiogram, victoria beckham

17 letters:
antiparallelogram, compiling program, echoencephalogram, electro-oculogram, electrocardiogram, electrogastrogram, electroretinogram, executive program, f. murray abraham, hannah waddingham, incentive program, overseas telegram, political program, septemberprogramm, thromboelastogram

18 letters:
ballistocardiogram, computer programme, diagnostic program, electrocorticogram, killing of harambe, liechtensteinklamm, monitoring program, photoplethysmogram, retirement program, sustaining program, television program, vocational program

19 letters:
application program, educational program, electronystagmogram, hysterosalpingogram, pneumoencephalogram, supervisory program, translating program

20 letters:
electroencephalogram, interpretive program

21 letters:
jean-claude van damme

22 letters:
applications programme, rehabilitation program

23 letters:
contraceptive diaphragm

33 letters:
vocational rehabilitation program

5 letters:
jorum, serum, forum, durum, foram, purim

6 letters:
quorum, dirham

7 letters:
decorum, theorem

8 letters:
muharram

9 letters:
saccharum, karakoram, anthurium

11 letters:
blood serum, truth serum

16 letters:
binomial theorem