chat up vs coquet

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

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

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

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

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

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

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