2 Syllables: SU
bundle, crumble, crumpled, frontal, fumbled, funnel, grumble, humble, jumble, jungle, mongrel, mumbled, rumble, stumble, Trumbull, tumble, tunnel, uncle, uncle's
3 Syllables: USU
Found 22 words across 2 groupings. Skipped 13 excess words of a similar stem.