Does the word synonym have a synonym?

This is a bit of a tricky question! It depends on how you define "synonym":

* If you're looking for a word that means the *exact* same thing: There isn't really one. "Synonym" is already a very specific word.

* If you're looking for words that are similar in meaning: You could use words like equivalence, parallel, analog, or counterpart.

* If you're looking for a word that describes the *concept* of synonymy: You could use equivalency, interchangeability, parallelism, or correspondence.

So, the answer really depends on the context and what you're trying to convey!