southerly vs current of air

southerly and current of air both are nouns.

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

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

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

Other hypernyms of southerly include air current, wind.

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

southerly (adjective)	current of air (adjective)
from the south; used especially of wind
situated in or oriented toward the south

southerly (adverb)	current of air (adverb)
from the south
toward the south