impostor vs slicker

impostor and slicker both are nouns.

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

As nouns, slicker is a hypernym of impostor; that is, slicker is a word with a broader meaning than impostor:

Other hypernyms of impostor include beguiler, cheat, cheater, deceiver, trickster.

impostor (noun)	slicker (noun)
a person who makes deceitful pretenses	a macintosh made from cotton fabric treated with oil and pigment to make it waterproof
	someone who leads you to believe something that is not true
	a person with good manners and stylish clothing