fohn vs current of air

fohn and current of air both are nouns.

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

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

fohn: a warm dry wind that blows down the northern slopes of the Alps
current of air: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of fohn include air current, wind.

fohn (noun)	current of air (noun)
a warm dry wind that blows down the northern slopes of the Alps	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure