imposter vs pseudo

imposter and pseudo both are nouns.

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

As nouns, imposter and pseudo are synonyms defined as:

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

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

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