sweet talker vs pretender

sweet talker and pretender both are nouns.

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

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

sweet talker: someone with an assured and ingratiating manner
pretender: 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 dissembler, dissimulator, hypocrite, phoney, phony.

sweet talker (noun)	pretender (noun)
someone with an assured and ingratiating manner	a person who makes deceitful pretenses
	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