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

Found 28 words across 3 groupings. Skipped 3 excess words of a similar stem.