sweet-talk vs coax

sweet-talk is not a noun while coax is a noun.

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

As verbs, sweet-talk and coax are synonyms defined as:

sweet-talk and coax: influence or urge by gentle urging, caressing, or flattering

Other synonyms of sweet-talk include blarney, cajole, inveigle, palaver, wheedle.

sweet-talk (noun)	coax (noun)
	a transmission line for high-frequency signals

sweet-talk (verb)	coax (verb)
influence or urge by gentle urging, caressing, or flattering	influence or urge by gentle urging, caressing, or flattering