pseud vs imposter

pseud and imposter both are nouns.

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

As nouns, pseud and imposter are synonyms defined as:

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

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