Or search: alien, extraneous, inessential, unessential, adscititious, adventitious
2 Syllables: SU
clinic, cynic, hinted, interests, kindred, kingship, kinship, limits, limpid, linguist, mimic, printed, stinted, timid, tinted, winded
3 Syllables: USU
distinguished, extinguished, imprinted, intrinsic, Olympic, relinquished, reprinted, rescinded
4 Syllables: UUSU
undistinguished

Found 25 words across 3 groupings. Skipped 1 excess word of a similar stem.