sweet talker vs dissembler

sweet talker and dissembler both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet talker	Yes	No	No	No
dissembler	Yes	No	No	No

As nouns, dissembler is a hypernym of sweet talker; that is, dissembler is a word with a broader meaning than sweet talker:

sweet talker: someone with an assured and ingratiating manner
dissembler: a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives

Other hypernyms of sweet talker include dissimulator, hypocrite, phoney, phony, pretender.

sweet talker (noun)	dissembler (noun)
someone with an assured and ingratiating manner	a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives