coquet vs chat up

coquet is a noun but chat up is not a noun.

Word	Noun	Adjective	Verb	Adverb
coquet	Yes	No	Yes	No
chat up	No	No	Yes	No

As verbs, coquet and chat up are synonyms defined as:

coquet and chat up: talk or behave amorously, without serious intentions

Other synonyms of coquet include butterfly, coquette, dally, flirt, mash, philander, romance.

coquet (noun)	chat up (noun)
a seductive man who uses his sex appeal to exploit women

coquet (verb)	chat up (verb)
talk or behave amorously, without serious intentions	talk or behave amorously, without serious intentions
	talk to someone with the aim of persuading him