harmattan vs current of air

harmattan and current of air both are nouns.

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

As nouns, current of air is a hypernym of harmattan; that is, current of air 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
current of air: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of harmattan include air current, wind.

harmattan (noun)	current of air (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