sweet-talk vs persuade

sweet-talk and persuade both are verbs.

Word	Noun	Adjective	Verb	Adverb
sweet-talk	No	No	Yes	No
persuade	No	No	Yes	No

As verbs, persuade is a hypernym of sweet-talk; that is, persuade is a word with a broader meaning than sweet-talk:

sweet-talk: influence or urge by gentle urging, caressing, or flattering
persuade: cause somebody to adopt a certain position, belief, or course of action; twist somebody's arm

sweet-talk (verb)	persuade (verb)
influence or urge by gentle urging, caressing, or flattering	cause somebody to adopt a certain position, belief, or course of action; twist somebody's arm
	win approval or support for