mountebank vs slicker

mountebank and slicker both are nouns.

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

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

mountebank: a flamboyant deceiver; one who attracts customers with tricks or jokes
slicker: someone who leads you to believe something that is not true

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

mountebank (noun)	slicker (noun)
a flamboyant deceiver; one who attracts customers with tricks or jokes	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