Or search: yen, pining, yearning, hankering, nostalgia, discontent, wistfulness, discontentment
2 Syllables: SU
awning, bombing, bonding, Brahmin, calming, dawning, fawning, flaunting, haunting, launching, longings, prompting, taunting, thronging, Unwin, wanting, yawning
3 Syllables: USU
belonging, desponding, prolonging, responding
4 Syllables: UUSU
corresponding

Found 22 words across 3 groupings. Skipped 3 excess words of a similar stem.