1 syllable:
bell's, belles, bells, bells', bels, belz, cell's, celles, cells, cells', cels, chelles, chels, dell's, dells, dwells, elles, els, fells, fels, frels, gelles, gels, hell's, helles, hells, jells, keells, kells, knells, l's, l.'s, l.s, mel's, melles, mells, nehls, nelles, nells, nels, peles, pell's, pelles, pels, pelz, quells, schmelz, schmelze, selles, sells, selz, shell's, shells, shels, skells, smells, snells, spells, steles, stelze, swells, telles, tells, welles, welles', wells, welz, yells

2 syllables:
accels, adele's, adell's, apelles, arnelle's, ateles, barbells, battelle's, battels, bedells, blackwell's, bluebells, bombshells, boswells, bow-bells, bozell's, bridewells, brown bells, burrell's, caldwells, cartel's, cartels, carvels, centel's, chandelles, channell's, clamshells, cockwell's, compels, cornell's, cornels, cowbells, dawn wells, dispels, doorbells, dumbbells, eggshells, excel's, excels, expels, ezell's, falwell's, farewells, fidel's, flat-fells, foretells, gazelles, greenfell's, groundswells, handbells, harebells, hotel's, hotels, hotels', impels, indwells, inkwells, intel's, jumelles, lapels, mantels, marcels, mattel's, maxwell's, maxwells, michel's, michelle's, michels, misspells, montel's, moselles, motels, nacelles, nextel's, noel's, noels, nouvelles, novell's, nutshells, o'dell's, orwell's, outsells, pactel's, pangels, pasteles, pastels, peach bells, propels, quenelles, rakehells, rappelz, ravel's, rebels, repels, resells, retells, rintel's, rintels, rintels', rochelle's, rockwell's, rothwells, sarcelles, seashells, sheftel's, snackwell's, snackwells, speedwells, stairwells, stillwell's, stinel's, sweet bells, varvels, vertel's, vielles

3 syllables:
alcatel's, allan wells, ariels, bagatelles, caravels, carousels, carrousels, chanterelles, christmas bells, citadel's, citadels, citrucel's, clienteles, cockerels, cockleshells, coral-bells, coralbells, dardanelles, demoiselles, fontanelles, fontanels, gabriels, h. g. wells, honeybells, honeywell's, immortelles, ingoldmells, livingwell's, merry-bells, merry bells, mirabelles, mission bells, moskatel's, muscatels, novotels, organelles, oriels, oversells, parallels, photocells, praxiteles, tortoiseshells, undersells, villanelles, yellow bells, zinfandels

4 syllables:
accorhotels, mademoiselles, materiels, mesdemoiselles, orchestral bells, vicontiels, whispering bells

5 syllables:
antiparallels, death of brian wells

7 syllables:
california yellow bells