wester vs current of air

wester and current of air both are nouns.

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

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

wester: wind that blows from west to east
current of air: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of wester include air current, wind.

wester (noun)	current of air (noun)
wind that blows from west to east	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure