Or search: mono, monophonic
1 Syllable: S
2 Syllables: SU
2 Syllables: US
3 Syllables: USU
apostle, colossal, debacle, impartial, Macdonald, McDonald, remodel, remodelled, unlawful
4 Syllables: UUSU

Found 57 words across 5 groupings. Skipped 18 excess words of a similar stem.