2 Syllables: SU
bridging, bristling, christening, Christian, differing, drifting, fishing, given, giving, glistening, Griffin, hissing, itching, kissing, lifting, listening, listing, living, Mifflin, missing, pigeon, pitching, risking, sifting, sniffing, stiffening, stitching, switching, twisting, twitching, whistling, wishing, writhing
3 Syllables: USU
assisting, bewitching, consisting, dismissing, enlisting, enriching, existing, forgiving, insisting, misgiving, persisting, resisting, subsisting, thanksgiving
4 Syllables: UUSU
Found 48 words across 3 groupings. Skipped 3 excess words of a similar stem.