Or search: odd, rum, funny, rummy, signifier
2 Syllables: SU
simpler
3 Syllables: SUU
insecure, insular, integer, miniatures, signature, similar
4 Syllables: USUU
contributor, dissimilar, distributor, Peninsular

Found 11 words across 3 groupings. Skipped 3 excess words of a similar stem.