2 Syllables: SU
beckon, bedding, Bedlam, begging, betting, Breton, checking, deaden, deadening, dreading, ebbing, Edmond, Edmund, Edwin, Epsom, extant, fretting, getting, heading, leaden, Leben, letting, meddling, netting, pecking, pregnant, reading, reckon, reckoning, reckons, rectum, reddened, requiem, second, section, segment, septum, setting, settling, 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, annexing, begetting, besetting, collecting, collection, complexion, conception, connecting, connection, connexion, convection, correcting, correction, deception, defection, deflection, dejection, detecting, detection, directing, directions, dissecting, ejection, electing, election, erecting, erection, excepting, exception, expectant, expecting, forgetting, inception, infecting, infection, inflection, injecting, injection, inspecting, inspection, investment, neglecting, objecting, objection, perception, perfecting, perfection, perplexing, projecting, projection, prospecting, protecting, protection, reception, reflecting, reflection, reflexion, regretting, rejecting, rejection, respecting, selecting, selection, subjecting, subjection, suspecting, unsettling, upsetting
4 Syllables: UUSU
circumspection, disaffection, imperfection, insurrection, intercepting, interregnum, intersecting, intersection, introspection, Mahometan, misconception, preconceptions, predilection, recollecting, recollection, reelection, resurrection, unsuspecting
Found 149 words across 4 groupings. Skipped 41 excess words of a similar stem.