2 Syllables: SU
3 Syllables: SUU
bitterest, frivolous, limitless, literate, rigorous, seriousness, silicate, Spiritus, syllabus, timorous, vigorous, villainous
3 Syllables: USU
4 Syllables: USUU
antithesis, carnivorous, considerate, felicitous, illiterate, indigenous, legitimate, solicitous, vociferous
5 Syllables: UUSUU
Found 25 words across 5 groupings. Skipped 1 excess word of a similar stem.