1 Syllable: S
act, aft, app, apt, as, ash, ask, asp, ass, ast, at, ax, axe, back, badge, bask, basque, bass, bast, bat, batch, bath, bats, black, blast, bras, cache, calf, cap, capped, caps, capt, cas, cash, cask, cass, cast, caste, casts, cat, catch, cats, chaff, chap, chat, clap, clapped, clash, clasp, class, crack, craft, crash, crass, das, dash, dat, draft, draught, fac, fact, fast, fat, fax, flap, flapped, flaps, flash, flask, flat, flax, gap, gas, gash, gasped, gasps, glass, gnat, graf, graft, graph, grasp, grass, hack, half, halved, halves, hap, has, hash, hast, hat, hatch, hath, hats, have, jack, jacques, jas, jazz, katz, kept, knack, knapp, lac, lack, lap, lapped, laps, lapse, lash, lass, last, lat, latch, lath, laugh, lax, mac, mack, maj, mak, map, mapped, maps, mash, mask, mass, masse, mast, mat, match, math, mats, matt, max, nap, nash, nat, pack, pact, pap, pass, past, pat, patch, path, pax, plaque, plat, platt, prac, pratt, quack, rack, raft, rap, rapped, rapt, ras, rash, rat, sac, sachs, sack, sacs, sap, sapped, sash, sat, saxe, scat, scrap, scratch, shack, shaft, slack, slap, slapped, slash, smack, smash, snack, snap, snapped, snaps, snatch, spat, splash, stack, staff, stat, strap, strapped, straps, tack, tact, taft, tak, tap, tapped, taps, task, tat, tax, that, thatch, that's, thrash, track, tract, trap, trapped, traps, trash, vas, vast, vat, wax, wrap, wrapped, wraps, wrapt, wrath
2 Syllables: SU
abstract, combat, compact, contract, contrast, detach, extract, forecasts, impact, impasse, morass, outlast
2 Syllables: US
aback, abashed, adapt, aghast, alas, alsace, amass, attach, attack, attract, begat, behalf, collapse, combats, cravat, despatch, detached, detract, dispatch, distract, ducats, elapse, enact, entrap, entrapped, exact, harass, intact, perhaps, react, recast, relapse, relax, repast, retract, subtract, surpass, thereat, transact, unmasked, unmatched, unpacked, whereas, whereat
3 Syllables: UUS
Found 285 words across 4 groupings. Skipped 115 excess words of a similar stem.