femme fatale vs temptress

femme fatale and temptress both are nouns.

Word	Noun	Adjective	Verb	Adverb
femme fatale	Yes	No	No	No
temptress	Yes	No	No	No

As nouns, femme fatale and temptress are synonyms defined as:

femme fatale and temptress: a woman who is considered to be dangerously seductive

Other synonyms of femme fatale include Delilah, enchantress, siren.

femme fatale (noun)	temptress (noun)
a woman who is considered to be dangerously seductive	a woman who is considered to be dangerously seductive