mistral vs boreas

mistral and boreas both are nouns.

Word	Noun	Adjective	Verb	Adverb
mistral	Yes	No	No	No
boreas	Yes	No	No	No

As nouns, boreas is a hypernym of mistral; that is, boreas is a word with a broader meaning than mistral:

Other hypernyms of mistral include north wind, norther, northerly.

mistral (noun)	boreas (noun)
a strong north wind that blows in France during the winter	a wind that blows from the north