Or search: emit, peep, chirp, utter, cheep, chitter, twitter
2 Syllables: SU
bearded, briefest, cheapest, chiefest, dearest, deepest, Egypt, Enoch, epoch, keenest, leaflet, meanest, nearest, peanut, reflux, secret, spirit, sweetest, syrup, weakest, zealots
3 Syllables: USU
extremest, extremists, machinist, severest, sincerest

Found 26 words across 2 groupings. Skipped 3 excess words of a similar stem.