soft-soap vs coax

soft-soap is not a noun while coax is a noun.

Word	Noun	Adjective	Verb	Adverb
soft-soap	No	No	Yes	No
coax	Yes	No	Yes	No

As verbs, coax is a hypernym of soft-soap; that is, coax is a word with a broader meaning than soft-soap:

Other hypernyms of soft-soap include blarney, cajole, inveigle, palaver, sweet-talk, wheedle.

soft-soap (noun)	coax (noun)
	a transmission line for high-frequency signals

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