Synonyms of trilogy

1 Syllable
trey, leash, triad, trio
2 Syllables
troika, triptych, ternion, trine, triune, triangle, trivium, triplet, triplex
3 Syllables
trinity, triunity, threesome
4 Syllables
triumvirate, tripartition, triplication, trichotomy, triplicity, triplicate