catabatic wind vs air current

catabatic wind and air current both are nouns.

Word	Noun	Adjective	Verb	Adverb
catabatic wind	Yes	No	No	No
air current	Yes	No	No	No

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

catabatic wind: a wind caused by the downward motion of cold air
air current: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of catabatic wind include current of air, wind.

catabatic wind (noun)	air current (noun)
a wind caused by the downward motion of cold air	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure