impostor vs role player

impostor and role player both are nouns.

Word	Noun	Adjective	Verb	Adverb
impostor	Yes	No	No	No
role player	Yes	No	No	No

As nouns, impostor and role player are synonyms defined as:

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

impostor (noun)	role player (noun)
a person who makes deceitful pretenses	a theatrical performer
	a person who makes deceitful pretenses