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2 Syllables: SU
bubbling, budding, chuckling, coupling, cutting, doubling, Dublin, ducking, flooding, hugging, juggling, jutting, plucking, plugging, putting, rubbing, scrubbing, shrugging, shutting, smuggling, struggling, strutting, sucking, suckling, troubling, tugging
3 Syllables: USU
conducting, constructing, corrupting, deducting, disrupting, instructing, obstructing
4 Syllables: UUSU
interrupting, reconstructing

Found 35 words across 3 groupings. Skipped 1 excess word of a similar stem.