Or search: maundy, funeral, pageant, wedding, ceremony, honoring, sighting, abidance, formality, induction, hymeneals, ceremonial, compliance, conformity, dedication
3 Syllables: SUU
burgesses, furnaces, purchases, purposes, surfaces, surpluses
4 Syllables: USUU
affirmative, alternative, conservative, disturbances, divergences, interpretive, occurrences, preservative, superlative

Found 15 words across 2 groupings. Skipped 2 excess words of a similar stem.