boreas vs tramontana

boreas and tramontana both are nouns.

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

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

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

Other hyponyms of boreas include bise, bize, mistral, tramontane.

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