northerly vs air current

northerly and air current both are nouns.

Word	Noun	Adjective	Verb	Adverb
northerly	Yes	Yes	No	Yes
air current	Yes	No	No	No

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

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

Other hypernyms of northerly include current of air, wind.

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

northerly (adjective)	air current (adjective)
coming from the north; used especially of wind
oriented toward the north

northerly (adverb)	air current (adverb)
in a northern direction