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Synonymy/Meaning/Analyticity/Fodor: there is no reason to assume that these concepts can be combined with any invariant property in the behavior of the speakers. - But not every central concept of a science must be linked to behavior - e.g. grammar. - Solution: a behavioral trait that belongs to all and only to the grammatically correct sentences. - However, this need not exist.
Synonymy/Analyticity/Fodor/Lepore: required when seeking an epistemic criterion of truth: E.g. that is by virtue of meaning - Even in case of Humean similarity (e.g. ideas that are similar to the same things are the same ideas) - Also with confirmation relationships for truth (Skinner, behaviorism) - Deliver the truth also with nomological relations. - (facts over meaning).
J. Fodor/E. Lepore
Holism Cambridge USA Oxford UK 1992