Or search: diligent
2 Syllables: SU
beaming, beating, being, bidden, bidding, billing, bleaching, bleating, bleeding, breathing, breeding, bridging, brimming, bristling, ceasing, ceding, ceiling, cheating, cheering, chilling, chipping, christening, cleaning, clearing, cleaving, clicking, clipping, creaking, creeping, crippling, dealing, deeming, differing, digging, dipping, dreaming, drilling, dripping, earrings, easing, eating, even, fearing, feasting, feeding, feeling, filling, fishing, fitting, fleeing, fleeting, flitting, freeing, freezing, gearing, getting, Gibbons, giggling, given, giving, gleaming, gleanings, glistening, greeting, grieving, Griffin, grinning, gripping, healing, heaping, hearing, heating, heaving, heeding, Higgins, hissing, hitting, itching, jeering, keeping, kicking, killing, Kipling, kissing, kneeling, knitting, leading, leaking, leaning, leaping, leasing, leaving, licking, listening, listing, living, meaning, meeting, middling, Mifflin, milling, missing, nearing, needing, nibbling, peeling, peeping, peering, picking, piercing, pigeon, pinning, pitching, pitting, pleading, pleasing, preaching, precinct, pricking, printing, quitting, reaching, reading, realism, reaping, rearing, reeking, reeling, ridding, rigging, ripping, rippling, risking, scheming, screaming, screeching, screening, scribbling, sealing, seating, seeding, seedlings, seeing, seeking, seeming, seething, seizing, shearing, shilling, shipping, shrieking, siblings, sinning, sipping, sitting, skimming, skipping, sleeping, slipping, smiting, sneaking, sneering, sneezing, sniffing, speaking, speeding, spilling, spinning, spitting, splitting, squeaking, squeezing, stealing, steaming, steering, sticking, stitching, streaming, stripling, stripping, sweeping, swimming, switching, syringe, teaching, tearing, teasing, teeming, thieving, thinning, thrilling, ticking, tilings, tilling, tipping, treating, trickling, trimming, tripping, twisting, twitching, weaning, weaving, weeding, weekend, weeping, wheeling, whipping, whistling, willing, winning, wishing, writhing
3 Syllables: SUU
3 Syllables: USU
4 Syllables: UUSU
5 Syllables: UUUSU

Found 309 words across 5 groupings. Skipped 25 excess words of a similar stem.