backwash vs airstream

backwash and airstream both are nouns.

Word	Noun	Adjective	Verb	Adverb
backwash	Yes	No	No	No
airstream	Yes	No	No	No

As nouns, backwash and airstream are synonyms defined as:

backwash and airstream: the flow of air that is driven backwards by an aircraft propeller

Other synonyms of backwash include race, slipstream, wash.

backwash (noun)	airstream (noun)
the wave that spreads behind a boat as it moves forward	a relatively well-defined prevailing wind
the flow of air that is driven backwards by an aircraft propeller	the flow of air that is driven backwards by an aircraft propeller
the consequences of an event (especially a catastrophic event)