LSJ
ου, ὁ, member of a sect, Porph. Abst. 4.11 (v.l. αἱρετισταῖς); — fem. αἱρεσιῶτις, πολιτεία Suid.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
ὁ, fem. -ῶτις, Ketzer, K.S.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)