Or search: meme, finish, polish, biology, starter, ontogeny, archeology, maturation, refinement, archaeology, cultivation, discernment, ontogenesis, appreciation, civilisation
2 Syllables: SU
color, colour, cultured, cultures, duller, earlier, lovelier, Muller, sculptor, sculpture, sulfur, sulphur, ulcer, Ulster, vulgar, vulture
3 Syllables: USU
discolored, discoloured

Found 18 words across 2 groupings. Skipped 9 excess words of a similar stem.