raincoat vs mackintosh

raincoat and mackintosh both are nouns.

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

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

Other hyponyms of raincoat include Burberry, mac, macintosh, mack, trench coat.

raincoat (noun)	mackintosh (noun)
a water-resistant coat	a lightweight waterproof (usually rubberized) fabric
	a waterproof raincoat made of rubberized fabric