airstream vs current of air

airstream and current of air both are nouns.

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

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

airstream: a relatively well-defined prevailing wind
current of air: air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure

Other hypernyms of airstream include air current, wind.

airstream (noun)	current of air (noun)
a relatively well-defined prevailing wind	air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure
the flow of air that is driven backwards by an aircraft propeller