Or search: gape, gawk, gawp
1 Syllable: S
Charles
2 Syllables: SU
awful, Basel, bottle, brothel, causal, Connell, docile, Donald, fossil, gospel, hobbled, hostile, jostled, lawful, model, modelled, models, mottled, nostrils, novel, nozzle, offal, Ronald, snarled, squabble, thoughtful, throttle, topple
2 Syllables: US
withdrawal
3 Syllables: USU
apostle, colossal, debacle, Macdonald, McDonald, remodel, remodelled, unlawful

Found 38 words across 4 groupings. Skipped 10 excess words of a similar stem.