southwester vs current of air

southwester and current of air both are nouns.

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

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

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

Other hypernyms of southwester include air current, wind.

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