Full Idea
The definition of analytic truth which has, I believe, the most chance of success is one in terms of synonymy; ..an analytic truth is one which can be transformed into a logical truth once synonyms are replaced by synonyms.
Gist of Idea
An analytic truth is one which becomes a logical truth when some synonyms have been replaced
Source
David E. Cooper (Philosophy and the Nature of Language [1973], §7.1)
Book Reference
Cooper,David E.: 'Philosophy and the Nature of Language' [Longman 1979], p.165
A Reaction
Sounds promising, though there is Quine's notorious problem of circularity in all these concepts. If synonymy is conventional, then so is analyticity. I personally feel that the circle can be broken.