south wind vs current of air

south wind and current of air both are nouns.

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

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

south wind: 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 south wind include air current, wind.

south wind (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