Or search: worm, beast, borer, brute, fauna, sponge, mollusk, zoology, mollusc, rotifer, creature, bryozoan, phoronid, polyzoan, zoophyte
3 Syllables: SUU
circulate, germinate, hurricane, journalist, perpetrate, surrogate, terminate, Uruguay, vertebrae, vertebrate
4 Syllables: USUU
determinate, exterminate, interpreted

Found 13 words across 2 groupings. Skipped 4 excess words of a similar stem.