2 Syllables: SU
beckon, bedding, Bedlam, begging, betting, Breton, checking, deaden, deadening, dreading, ebbing, Edmond, Edmund, Edwin, Epsom, extant, extras, fretting, getting, heading, leaden, Leben, letting, meddling, netting, pecking, pregnant, reading, reckon, reckoning, reckons, rectum, reddened, requiem, second, section, segment, septum, setting, settling, sexes, sexton, shedding, spectrum, spreading, stepping, sweating, threading, threaten, threatening, threatens, treading, veteran, vexing, weapon, wedding, wetting, wrecking
3 Syllables: SUU
3 Syllables: USU
abetting, acceptance, accepting, affecting, affection, affective, annexing, begetting, besetting, collecting, collection, collective, complexion, conception, connecting, connection, connective, connexion, convection, correcting, correction, corrective, deception, deceptive, defection, defective, deflection, dejection, detecting, detection, detective, directing, direction, directive, dissecting, ejection, electing, election, elective, erecting, erection, excepting, exception, expectant, expecting, forgetting, inception, infecting, infection, inflection, injecting, injection, inspecting, inspection, invective, investment, neglecting, objecting, objection, objective, perception, perceptive, perfecting, perfection, perplexing, perspective, projecting, projection, prospecting, prospective, protecting, protection, protective, reception, receptive, reflecting, reflection, reflective, reflexion, regretting, rejecting, rejection, respecting, respective, selecting, selection, selective, subjecting, subjection, subjective, suspecting, unsettling, upsetting
4 Syllables: UUSU
circumspection, disaffection, imperfection, ineffective, insurrection, intercepting, interregnum, intersecting, intersection, introspection, introspective, irrespective, Mahometan, misconception, preconceptions, predilection, recollecting, recollection, reelection, resurrection, retrospective, unsuspecting
Found 176 words across 4 groupings. Skipped 46 excess words of a similar stem.