backwash vs aftermath

backwash and aftermath both are nouns.

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

As nouns, backwash and aftermath are synonyms defined as:

backwash and aftermath: the consequences of an event (especially a catastrophic event)

Other synonyms of backwash include wake.

backwash (noun)	aftermath (noun)
the wave that spreads behind a boat as it moves forward	the outcome of an event especially as relative to an individual
the flow of air that is driven backwards by an aircraft propeller	the consequences of an event (especially a catastrophic event)
the consequences of an event (especially a catastrophic event)