headwind vs current of air

headwind and current of air both are nouns.

Word	Noun	Adjective	Verb	Adverb
headwind	Yes	No	No	No
current of air	Yes	No	No	No

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

headwind: wind blowing opposite to the path of a ship or aircraft
current of air: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of headwind include air current, wind.

headwind (noun)	current of air (noun)
wind blowing opposite to the path of a ship or aircraft	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure