Or search: trope, hearth
3 Syllables: SUU
credibly, deputies, deputy, ecstasy, equity, expertly, medically, pedigree, rectory, separately
4 Syllables: USUU
acceptably, complexity, exceptionally, expectancy, heredity, incredibly, integrity, perplexity, refectory, regretfully, respectably, respectfully, trajectory
5 Syllables: UUSUU
Directory

Found 24 words across 3 groupings. Skipped 1 excess word of a similar stem.