katabatic wind vs air current

katabatic wind and air current both are nouns.

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

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

katabatic 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 katabatic wind include current of air, wind.

katabatic 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