sou'wester vs current of air

sou'wester and current of air both are nouns.

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

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

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

sou'wester (noun)	current of air (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