chat up vs persuade

chat up and persuade both are verbs.

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

As verbs, persuade is a hypernym of chat up; that is, persuade is a word with a broader meaning than chat up:

chat up: talk to someone with the aim of persuading him
persuade: cause somebody to adopt a certain position, belief, or course of action; twist somebody's arm

chat up (verb)	persuade (verb)
talk or behave amorously, without serious intentions	cause somebody to adopt a certain position, belief, or course of action; twist somebody's arm
talk to someone with the aim of persuading him	win approval or support for