The noun form of overgeneralize is overgeneralization, which refers to the act of overgeneralizing or an instance of doing so.

What is overgeneralization?

Definition of overgeneralize : to generalize excessively: such as. a intransitive : to make excessively vague or general statements about something or someone Of course, I am guilty here of grossly overgeneralizing, of caricaturing.—

What's another word for overgeneralization?

distortedgeneralisedUKoversimplifiedover reducedreducedmade too simplemade a sweeping statementtook a broad viewtaken a broad view