impostor vs shammer

impostor and shammer both are nouns.

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

As nouns, impostor and shammer are synonyms defined as:

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

impostor (noun)	shammer (noun)
a person who makes deceitful pretenses	a person who makes deceitful pretenses
	someone shirking their duty by feigning illness or incapacity