sweet talk vs soft soap

sweet talk and soft soap both are nouns.

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

As nouns, sweet talk and soft soap are synonyms defined as:

Other synonyms of sweet talk include blarney, coaxing.

sweet talk (noun)	soft soap (noun)
flattery designed to gain favor	a soft (or liquid) soap made from vegetable oils; used in certain skin diseases
	flattery designed to gain favor