Or search: bidder, mortal, someone, applier, aspirer, aspirant, claimant, somebody, wannabee, requester, suppliant, submitter, petitioner
3 Syllables: SUU
Addison, Addison's, Africans, aliment, Alison, Allison, applicants, Fascism, garrison, Madison, talisman, Vatican
4 Syllables: USUU
inhabitant, Mohammedan

Found 14 words across 2 groupings. Skipped 1 excess word of a similar stem.