southerly vs air current

southerly and air current both are nouns.

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

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

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

Other hypernyms of southerly include current of air, wind.

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

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