north wind vs current of air

north wind and current of air both are nouns.

Word	Noun	Adjective	Verb	Adverb
north wind	Yes	No	No	No
current of air	Yes	No	No	No

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

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

Other hypernyms of north wind include air current, wind.

north wind (noun)	current of air (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