Or search: collector, aggregator, numismatologist
3 Syllables: SUU
bishopric, chrysalis, disparate, hypocrite, Limerick, syphilis, ticklish
4 Syllables: USUU
archbishopric, derivative, Elisabeth, Elizabeth, episcopate, initiative, invigorate, religionists
5 Syllables: UUSUU
illegitimate, inconsiderate

Found 17 words across 3 groupings. Skipped 4 excess words of a similar stem.