harmattan vs air current

harmattan and air current both are nouns.

Word	Noun	Adjective	Verb	Adverb
harmattan	Yes	No	No	No
air current	Yes	No	No	No

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

harmattan: a dusty wind from the Sahara that blows toward the western coast of Africa during the winter
air current: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of harmattan include current of air, wind.

harmattan (noun)	air current (noun)
a dusty wind from the Sahara that blows toward the western coast of Africa during the winter	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure