Or search: bawl, emit, roar, wail, yell, yawl, yawp, yowl, waul, wawl, yaup, hollo, laugh, shout, utter
1 Syllable: S
bowel, cowl, foul, fowl, growl, Howell, howled, howls, owl, prowl, scowl, souled, towel, vowel
2 Syllables: US
avowal

Found 15 words across 2 groupings. Skipped 7 excess words of a similar stem.