blarney vs sweet-talk

blarney is a noun but sweet-talk is not a noun.

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

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

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

Other synonyms of blarney include cajole, coax, inveigle, palaver, wheedle.

blarney (noun)	sweet-talk (noun)
flattery designed to gain favor

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