1 Syllable: S
acts, aft, as, ash, ask, asp, ass, ast, ax, axe, backs, badge, bask, basque, bass, bast, batch, bath, bats, blacks, blast, bras, cache, calf, caps, cas, cash, cask, cass, cast, caste, casts, catch, cats, chaff, chaps, clash, clasp, class, cracks, craft, crash, crass, das, dash, draft, draught, facts, fast, fats, fax, flaps, flash, flask, flats, flax, gaps, gas, gash, gasp, glass, gnats, graf, graft, graph, grasp, grass, half, halved, halves, haps, has, hash, hast, hatch, hath, hats, have, jacks, jas, jazz, katz, lacks, laps, lapse, lash, lass, last, latch, lath, laugh, lax, maj, maps, mash, mask, mass, masse, mast, match, math, mats, max, nash, packs, pass, past, patch, path, pax, plaques, quacks, racks, raft, ras, rash, rats, sachs, sacks, sacs, sash, saxe, scraps, scratch, shaft, slash, smacks, smash, snaps, snatch, splash, stacks, staff, straps, tacks, taft, taps, task, tax, thatch, that's, thrash, tracks, tracts, traps, trash, vast, vats, wax, wraps, wrath
2 Syllables: SU
2 Syllables: US
abashed, adapts, aghast, alas, alsace, amass, attach, attacks, attracts, behalf, collapse, combats, despatch, detached, detracts, dispatch, ducats, elapse, enacts, exacts, harass, perhaps, reacts, recast, relapse, relax, repast, surpass, unmasked, unmatched, whereas
3 Syllables: UUS
Found 196 words across 4 groupings. Skipped 67 excess words of a similar stem.