Or search: brush, maker, rotor, setup, coiner, engine, stator, shaper, magneto, apparatus, oscillator
4 Syllables: SUUU
educator, elevator, generators, legislator, legislature, liberator, moderator, operator, procurator
5 Syllables: USUUU
collaborator, investigator, refrigerator

Found 12 words across 2 groupings. Skipped 4 excess words of a similar stem.