northwest wind vs air current

northwest wind and air current both are nouns.

Word	Noun	Adjective	Verb	Adverb
northwest wind	Yes	No	No	No
air current	Yes	No	No	No

As nouns, air current is a hypernym of northwest wind; that is, air current is a word with a broader meaning than northwest wind:

northwest wind: a wind from the northwest
air current: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of northwest wind include current of air, wind.

northwest wind (noun)	air current (noun)
a wind from the northwest	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure