soft-soap vs palaver

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

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

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

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

soft-soap (noun)	palaver (noun)
	loud and confused and empty talk
	flattery intended to persuade

soft-soap (verb)	palaver (verb)
use flattering talk on somebody	have a lengthy discussion, usually between people of different backgrounds
persuade someone through flattery	influence or urge by gentle urging, caressing, or flattering
	speak (about unimportant matters) rapidly and incessantly