Synonyms of two-timer

1 Syllable
rat
2 Syllables
betrayer, traitors, quisling, weasel, judas, traitor, turncoat, casuist, bluffers
3 Syllables
treasonist, tartuffe, intriguers, intriguer, deceiver, back-stabber, colluder, backstabber, pharisee
4 Syllables
hypocrite, conspirator, double-dealer
6 Syllables
attitudinizer