impostor vs pseudo

impostor and pseudo both are nouns.

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

As nouns, impostor and pseudo are synonyms defined as:

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

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

impostor (adjective)	pseudo (adjective)
	(often used in combination) not genuine but having the appearance of