southwester vs air current

southwester and air current both are nouns.

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

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

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

Other hypernyms of southwester include current of air, wind.

southwester (noun)	air current (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