sou'wester vs air current

sou'wester and air current both are nouns.

Word	Noun	Adjective	Verb	Adverb
sou'wester	Yes	No	No	No
air current	Yes	No	No	No

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

sou'wester: 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 sou'wester include current of air, wind.

sou'wester (noun)	air current (noun)
waterproof hat with wide slanting brim longer in back than in front	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure
a strong wind from the southwest