Or search: pagan, mortal, heathen, someone, cultural, somebody, heathenish, irreligious
2 Syllables: SU
breasted, crested, desperate, Essex, ethic, nested, respite, rested, Sedgwick, spendthrift, tested, vested, wrested, wretched
3 Syllables: USU
arrested, attested, congested, detested, divested, domestic, infested, invested, majestic, molested, requested, suggested
4 Syllables: UUSU
undigested, unmolested

Found 28 words across 3 groupings. Skipped 2 excess words of a similar stem.