swindler vs slicker

swindler and slicker both are nouns.

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

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

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

swindler (noun)	slicker (noun)
a person who swindles you by means of deception or fraud	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