Or search: pyralidae, pyralididae
2 Syllables: SU
realist
3 Syllables: SUU
Beatrice, bishoprics, chrysalis, feverish, hypocrites, pianist, syphilis, theorist, ticklish
3 Syllables: UUS
idealists
4 Syllables: USUU
imperialist, materialist, religionists

Found 14 words across 4 groupings. Skipped 3 excess words of a similar stem.