macintosh vs oilskin

macintosh and oilskin both are nouns.

Word	Noun	Adjective	Verb	Adverb
macintosh	Yes	No	No	No
oilskin	Yes	No	No	No

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

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

Other hyponyms of macintosh include slicker.

macintosh (noun)	oilskin (noun)
a waterproof raincoat made of rubberized fabric	a macintosh made from cotton fabric treated with oil and pigment to make it waterproof
a lightweight waterproof (usually rubberized) fabric