imposter vs fraud

imposter and fraud both are nouns.

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

As nouns, imposter and fraud are synonyms defined as:

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

imposter (noun)	fraud (noun)
a person who makes deceitful pretenses	intentional deception resulting in injury to another person
	something intended to deceive; deliberate trickery intended to gain an advantage
	the act of swindling by some fraudulent scheme
	a person who makes deceitful pretenses