Or search: bum, loo, pot, tin, buns, buoy, butt, rear, rump, sack, tail, tush, prat, caddy, potty
1 Syllable: S
2 Syllables: SU
2 Syllables: US
3 Syllables: UUS
4 Syllables: UUUS

Found 252 words across 5 groupings. Skipped 81 excess words of a similar stem.