mackintosh vs slicker

mackintosh and slicker both are nouns.

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

As nouns, slicker is a hyponym of mackintosh; that is, slicker is a word with a more specific, narrower meaning than mackintosh:

mackintosh: a waterproof raincoat made of rubberized fabric
slicker: a macintosh made from cotton fabric treated with oil and pigment to make it waterproof

Other hyponyms of mackintosh include oilskin.

mackintosh (noun)	slicker (noun)
a lightweight waterproof (usually rubberized) fabric	a macintosh made from cotton fabric treated with oil and pigment to make it waterproof
a waterproof raincoat made of rubberized fabric	someone who leads you to believe something that is not true
	a person with good manners and stylish clothing