tramontane vs boreas

tramontane and boreas both are nouns.

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

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

tramontane: a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean
boreas: a wind that blows from the north

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

tramontane (noun)	boreas (noun)
a cold dry wind that blows south out of the mountains into Italy and the western Mediterranean	a wind that blows from the north

tramontane (adjective)	boreas (adjective)
on or coming from the other side of the mountains (from the speaker)
being or coming from another country