Or search: respondent, responsive
2 Syllables: SU
cancelling, dangling, gambling, handling, rambling, scrambling, strangling, wrangling
3 Syllables: SUU
anchoring, banqueting, canvassing, clambering, clamoring, clamouring, hammering, hampering, hankering, sanctioning, stammering, tampering
3 Syllables: USU
dismantling
4 Syllables: USUU
abandoning, meandering

Found 23 words across 4 groupings.