1 syllable:
bpharm, charm, charme, farm, flarm, harm, hdparm, larme, naarm, parme, pharm, scarm, sdarm, sharm, smarm, tharm

2 syllables:
a-arm, alarm, alarme, allarme, becharm, blinddarm, decharm, desarme, disarm, ducharme, ex-arm, firearm, fish-farm, forearm, gendarme, genpharm, gisarm, gisarme, guisarme, home-farm, iclarm, inarm, longarm, mallarme, non-farm, nonfarm, nufarm, polearm, prearm, proof-arm, pycharm, re-arm, rearm, round-arm, sadarm, schoolmarm, self-harm, short-arm, simfarm, small-arm, stiff-arm, straight-arm, strong-arm, strongarm, stud farm, tonearm, tree farm, truck farm, tulkarm, unarm, uncharm, windfarm, yard-arm, yardarm

3 syllables:
aquafarm, bioarm, buy the farm, canadarm, cattle farm, clarkson's farm, countercharm, dairy farm, disencharm, funny farm, good luck charm, love alarm, moneyfarm, novopharm, over-arm, overarm, prison farm, sewage farm, smoke alarm, super-pharm, under-arm, underarm, unicharm

4 syllables:
burglar alarm, collective farm, enobosarm, fire alarm, pneumatogarm, zonealarm

6 syllables:
repeating firearm

7 syllables:
automatic firearm

9 syllables:
semiautomatic firearm

1 syllable:
worm, germ, swarm, squirm, sperm, therm, corm, norm, warm, form, storm, firm, term, dorm

2 syllables:
unfirm, lukewarm, wave form, tongue worm, affirm, life form, beard worm, art form, claim form, short-term, deform, dust storm, reform, confirm, perform, long-term, ice storm, dew worm, free form, infirm, line storm, transform, wheat germ, full term, inform, law firm, conform, age norm, bound form, cairngorm, change form, full-term, hold firm, leaf form, red worm, school term, stand firm, take form, tax form, verse form, word form

3 syllables:
land reform, army worm, bladder worm, minor term, middle term, reconfirm, reaffirm, ribbon worm, guinea worm, misinform, major term, business firm, endoderm, episperm, fishing worm, isotherm, mesoderm, order form, peanut worm, plural form, prison term, railroad worm, remain firm, service firm, silver storm, velvet worm

4 syllables:
electric storm, brokerage firm, magnetic storm, combining form, sonata form, violent storm, measuring worm, accounting firm, annelid worm, carry to term, citation form, consulting firm, insurance firm, investment firm, meteor swarm, potato worm, proboscis worm, publishing firm, removal firm, segmented worm, singular form, telegraph form, tomato worm, vinegar worm

5 syllables:
electrical storm, academic term, application form, chordamesoderm, chordomesoderm, degree of a term, parasitic worm, presidential term, securities firm

7 syllables:
operation desert storm