1 Syllable: S
ab, act, ad, adds, ads, and, anne's, app, apt, as, at, ax, axe, back, bad, badge, bag, band, banged, bangs, banned, bat, bath, bats, black, bland, brag, brand, cab, cad, calves, canned, cans, cap, capped, caps, capt, cat, chap, chat, clad, clams, clans, clap, clapped, crab, crabbed, crabs, crack, crag, crammed, dab, dad, dammed, damned, dams, dans, dat, drab, drag, dragged, drags, fac, fact, fad, fag, fangs, fanned, fans, fat, fax, flag, flagged, flags, flange, flap, flapped, flaps, flat, flax, franz, gad, gag, gangs, gap, glad, gland, gnat, grab, grabbed, grams, grand, grande, grands, hack, had, hadst, hag, halved, halves, hams, hand, hanged, hangs, hans, hap, has, hat, hath, hats, have, jack, jacques, jagged, jammed, jams, jazz, katz, kept, knack, knapp, lab, lac, lack, lad, lag, lagged, lags, lambs, land, lap, lapped, laps, lapse, lat, lath, lax, mac, mack, mad, mag, maj, mak, mand, manned, mans, map, mapped, maps, mat, math, mats, matt, max, nad, nag, nap, nat, pack, pact, pad, pangs, pans, pap, pat, path, pax, plaid, planned, plans, plaque, plat, platt, prac, pratt, quack, rack, rag, rammed, rams, rand, rap, rapped, rapt, rat, sac, sachs, sack, sacs, sad, sag, sand, sans, sap, sapped, sat, saxe, scanned, scans, scat, scrap, shack, shad, shams, slab, slack, slag, slammed, slap, slapped, smack, snack, snap, snapped, snaps, spanned, spans, spat, stab, stabbed, stabs, stack, stag, stand, stat, strand, strap, strapped, straps, tab, tack, tact, tad, tag, tagged, tak, tanned, tap, tapped, taps, tat, tax, that, that's, track, tract, tramps, trans, trap, trapped, traps, vans, vat, wag, wax, wrap, wrapped, wraps, wrapt, wrath, zag
2 Syllables: SU
2 Syllables: US
3 Syllables: UUS
4 Syllables: UUUS

Found 311 words across 5 groupings. Skipped 87 excess words of a similar stem.