Or search: mortal, denizen, dweller, someone, somebody, habitant, earthling, tellurian, indweller, inhabitant
2 Syllables: SU
airing, Baring, bearing, caring, chairmen, Charing, daring, Elgin, erring, flaring, glaring, helping, herring, larynx, melting, Melvin, pairing, paring, pelting, pharynx, sharing, shelving, smelting, sparing, squaring, staring, swearing, tearing, wearing, welding
3 Syllables: USU
comparing, declaring, despairing, forbearing, impairing, preparing, repairing, unerring, unsparing
4 Syllables: UUSU
overbearing, overwhelming

Found 41 words across 3 groupings. Skipped 2 excess words of a similar stem.