oilskin vs mack

oilskin and mack both are nouns.

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

As nouns, mack is a hypernym of oilskin; that is, mack is a word with a broader meaning than oilskin:

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

Other hypernyms of oilskin include mac, macintosh, mackintosh.

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