Answer:
1 syllable:
boon, Boone, broun, bruen, brune, bruun, choon, clune, coon, coone, croon, dune, goon, gruen, heun, hewn, hoon, joon, June, keune, koon, koone, kroon, kuehn, kuehne, kuhn, loon, mhoon, moone, noon, noone, poon, prune, roone, schoon, shoen, soon, spoon, strewn, suen, swoon, thune, toon, toone, troon, tune, yoon
2 syllables:
antoon, aoun, attune, baboon, balloon, banoun, barloon, bassoon, bethune, buffoon, cahoon, calhoon, calhoun, Cancun, cardoon, cartoon, cocoon, cohoon, commune, corroon, dekroon, festoon, galloon, hamdoon, harpoon, harroun, high noon, huntoon, immune, impugn, karoun, karun, laffoon, lagoon, lampoon, liqun, magoon, majnoon, maroon, mattoon, mcclune, mccuen, mccune, mckune, monsoon, muldoon, platoon, pontoon, raccoon, rangoon, saloon, sand dune, sassoon, soup spoon, terhune, too soon, twelve noon, tycoon, typhoon, verboon, xiaoyun
3 syllables:
afternoon, Daniel Boone, dessert spoon, disharoon, ducommun, greasy spoon, kite balloon, oil tycoon, opportune, picayune, silver spoon, sugar spoon, viromune, wotherspoon
4 syllables:
barrage balloon, billiard saloon, common raccoon, contrabassoon, double bassoon, good afternoon, inopportune, pilot balloon, sausage balloon, sawdust saloon, signature tune, trial balloon
6 syllables:
animated cartoon
9 syllables:
meteorological balloon
from: rhymezone.com