imposter vs pretender

imposter and pretender both are nouns.

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

As nouns, imposter and pretender are synonyms defined as:

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

imposter (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