3 Syllables: SUU
crucifix, duplicate, Eucharist, humanist, humorous, ludicrous, luminous, lunatic, mutinous, numerous, ruinous, sewerage, superfluous, uterus
4 Syllables: USUU
5 Syllables: UUSUU
5 Syllables: UUUSU
Found 19 words across 4 groupings. Skipped 2 excess words of a similar stem.