The formation of concept from something is "conceptualize". But what about the formation of word from concept?
I can only think of bad substitutions like: "materialize from concepts" or even "wordify".
As a bonus, it would be even better if your suggestion originates from Cognitive Psychology, Psychology, or Philosophy.
Edit: What about specifically in the sense that "an abstract idea (conceptual meaning) becomes a concrete representation (lexical form)"?