Or search: info, privy, covert, enigma, inward, mystic, occult, orphic, parole, cabala, kabala, qabala, arcanum, cabbala, kabbala
2 Syllables: SU
ceaseless, clearest, edict, Egypt, Felix, freest, Friedrich, greenish, heedless, helix, lyric, peevish, penis, Phoenix, prefix, realist, Regis, Rhenish, scenic, secret, spirit, Swedish, thesis
3 Syllables: USU
acetic, albeit, collegiate, extremist, idealist, satiric, strategic, uncleanness
3 Syllables: UUS
idealists
4 Syllables: UUSU
exegesis, panegyric
5 Syllables: UUUSU
encyclopedic

Found 35 words across 5 groupings. Skipped 6 excess words of a similar stem.