1 Syllable: S
2 Syllables: SU
brewer, brewster, cooler, cooper, cooper's, cowper, cruder, cruiser, doers, fewer, future, hooper, hoover, hubert, humor, humour, junior, looser, loser, lucerne, lucre, luther, mover, mueller, neuter, newark, newer, nuclear, pewter, poorer, ruder, ruler, rumor, rumour, rupert, schooner, schuster, seward, sewer, smoother, sooner, steward, stewart, stewart's, stuarts, stupor, suitor, super, trooper, truer, tudor, tumor, tutor, uber, user, viewer
3 Syllables: USU
accuser, computer, consumer, intruder, maneuver, manoeuvre, peculiar, producer, pursuer, reviewer, seducer, untutored, vancouver
Found 70 words across 3 groupings. Skipped 32 excess words of a similar stem.