Or search: vie, bump, brush, clash, scrap, combat, replay, compete, contend, joining, assemble, confront, skirmish, alignment, connexion
1 Syllable: S
dour, flour, hour, our, scour, sour
2 Syllables: SU
Bauer, bower, counter, coward, Cowper, downward, flounder, flower, founder, Fowler, Gower, groundwork, hour's, housework, Howard, Howard's, louder, outer, outward, pounder, powder, power, prouder, scoured, shower, sounder, soured, stouter, tower, trousers, voucher
3 Syllables: USU
devour, empower, encountered, encounters, profounder
4 Syllables: UUSU
overpower

Found 43 words across 4 groupings. Skipped 26 excess words of a similar stem.