Getting stuck in definitions. Getting stuck in magical thinking that a thing is what we call it, or the notion that something is true by definition or “a priori”. Failing to see the distinction between terms/words, concepts/categories and phenomena, mistaking a word for in itself being what that word is trying to describe. Easily goes together with equivocations, as two persons who talk with each other may each be stuck in their own definitions and thus simply talk past for each other. (In Swedish: Termism.)
See also no true scotsman fallacy.
This is an abstraction of categorism.