impostor vs pretender

impostor and pretender both are nouns.

Word	Noun	Adjective	Verb	Adverb
impostor	Yes	No	No	No
pretender	Yes	No	No	No

As nouns, impostor and pretender are synonyms defined as:

Other synonyms of impostor include fake, faker, fraud, imposter, pseud, pseudo, role player, sham, shammer.

impostor (noun)	pretender (noun)
a person who makes deceitful pretenses	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