Or search: empiric, archaism, verifiable, archaicism, confirmable, existential, falsifiable, experiential, experimental, observational
3 Syllables: SUU
Biblical, clinical, critical, cyclical, cynical, digital, lyrical, mystical, mythical, physical, pinnacles, typical, vehicle
4 Syllables: USUU
atypical, centripetal, inimical, juridical, political, Rabbinical, satirical, statistical, umbilical, uncritical
5 Syllables: UUSUU
analytical, egotistical, hypocritical, indivisible, metaphysical

Found 28 words across 3 groupings. Skipped 1 excess word of a similar stem.