north wind vs boreas

north wind and boreas both are nouns.

Word	Noun	Adjective	Verb	Adverb
north wind	Yes	No	No	No
boreas	Yes	No	No	No

As nouns, north wind and boreas are synonyms defined as:

Other synonyms of north wind include norther, northerly.

north wind (noun)	boreas (noun)
a wind that blows from the north	a wind that blows from the north