sweet-talk vs soft-soap

sweet-talk and soft-soap both are verbs.

Word	Noun	Adjective	Verb	Adverb
sweet-talk	No	No	Yes	No
soft-soap	No	No	Yes	No

As verbs, soft-soap is a hyponym of sweet-talk; that is, soft-soap is a word with a more specific, narrower meaning than sweet-talk:

Other hyponyms of sweet-talk include browbeat, bully, swagger.

sweet-talk (verb)	soft-soap (verb)
influence or urge by gentle urging, caressing, or flattering	use flattering talk on somebody
	persuade someone through flattery