Or search: conk, exit, swim, choke, croak, expire, perish, decease, submerge, submerse, eliminate, overwhelm, extinguish
1 Syllable: S
bounce, bound, bowed, brown, Browne, browns, cloud, clown, coun, count, cowed, crowd, crown, down, drown, found, fount, frown, gown, ground, hound, housed, loud, lounge, mound, Mount, mouthed, noun, ounce, ploughed, plowed, pounce, pound, proud, round, roused, shroud, sound, sowed, town, Towne, towns, vowed, wound
2 Syllables: SU
compound, discount
2 Syllables: US
abound, account, aground, allowed, aloud, amount, announce, around, aroused, avowed, confound, denounce, dismount, downtown, endowed, espoused, expound, Guillaume, Macleod, profound, pronounce, propound, rebound, recount, redound, renounce, renown, resound, surmount, surround, unbound, unsound
3 Syllables: UUS
disallowed, disavowed

Found 80 words across 4 groupings. Skipped 41 excess words of a similar stem.