1 syllable:
bloom, blue&me, blum, blume, boom, boomm, broom, broome, brume, bthoom, choom, cloom, coomb, coombe, croom, crume, cu mm, dhoom, doom, droom, flume, froom, fume, gloom, glume, groom, groome, grume, heaume, hume, krume, kume, loom, neume, plume, pneum, reaume, rewme, rheaume, rheum, rhumb, rhume, roome, sh-boom, shoom, shroom, shtoom, sloom, spoom, spume, stoom, stroom, suhm, tomb, tombe, vroom, vroomm, whom, womb, zoom

2 syllables:
abloom, absume, addoom, agrume, artume, assume, backroom, ballroom, barroom, bath-room, bathroom, batoum, bedroom, bitume, boardroom, box-room, boxroom, bridegroom, broadloom, bunkroom, busboom, by-room, cardroom, changeroom, chatroom, checkroom, classroom, clean-room, cleanroom, cloakroom, clubroom, coatroom, consume, cookroom, cornblume, costume, courtroom, coutume, darkbloom, darkroom, dayroom, death-doom, deblum, deplume, despume, displume, drawloom, effume, embloom, emplume, enclume, engloom, entomb, enwomb, exhume, feldblum, fireroom, green-broom, greenroom, green broom, grillroom, guardroom, guestroom, gunroom, handloom, headroom, heirloom, herdgroom, homeroom, houseroom, icewm, illume, inhume, insume, intomb, jib-boom, jibboom, ka-boom, kaboom, keurboom, khartoum, laboum, laplume, legroom, legum, legume, lightroom, lindbloom, lunchroom, macroom, mailroom, maktoum, maybloom, mcbroom, mf doom, mtume, mudroom, mydoom, naboom, natsume, newsroom, okoume, outroom, pantoum, parfum, parfume, perfume, playroom, poolroom, pressroom, presume, push broom, raceroom, rebloom, reillume, relume, restroom, resume, reume, roseboom, royaume, salesroom, salume, schoolroom, scotch broom, showroom, sickroom, simoom, spekboom, staffroom, stateroom, stillroom, stockroom, storeroom, strongroom, subsume, sukhum, sumoom, sunroom, tap-room, taproom, tearoom, toolroom, transhume, transume, ubume, unplume, untomb, varoom, wardroom, wareroom, warkloom, washroom, weightroom, whiskbroom, white broom, witch broom, workroom

3 syllables:
a400m, after-room, alumbloom, ante-room, anteroom, apostume, baby-boom, baby boom, badaboom, boiler-room, butcher's broom, carpet loom, cfu-m, coffeeroom, common-room, common broom, corniplume, daremblum, desert plume, dining-room, diningroom, disentomb, disinhume, disselboom, drawing-room, dressing-room, elbow-room, elbowroom, figure loom, filoplume, foredoom, georgia groome, groovyroom, hecatomb, impostume, introsume, isohume, legalzoom, living-room, livingroom, locker-room, lockerroom, low-warp-loom, lumber-room, messroom, nom de plume, nutriboom, overgloom, pernille blume, petalum, potchefstroom, power loom, re-assume, reassume, ringelblume, rosenbloom, rosenblum, rosenboom, rozeboom, saleroom, scarlet plume, semiplume, silverboom, sitting-room, sonic boom, sonnenblume, spanish broom, tiring-room, vandenboom, wagenboom, weaver's broom, womb-to-tomb, yubitsume

4 syllables:
ame-no-uzume, artist's workroom, bathing costume, brodifacoum, chaparral broom, electroboom, google classroom, indigo broom, kemonozume, master bedroom, microphone boom, monster musume, overconsume, s1850m, swimming costume, weeping tree broom, white spanish broom, withdrawing-room

5 syllables:
5.8x42mm, adobe lightroom, dynamic headroom, masquerade costume, nehruviandoom

6 syllables:
academic costume

7 syllables:
assassination classroom