Or search: noma, canker, lesion
2 Syllables: SU
color, colour, culture, duller, earlier, lovelier, Muller, sculptor, sculpture, sulfur, sulphur, ulcers, Ulster, vulgar, vulture
3 Syllables: USU
discolored, discoloured

Found 17 words across 2 groupings. Skipped 10 excess words of a similar stem.