backwash vs outcome

backwash and outcome both are nouns.

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

As nouns, outcome is a hypernym of backwash; that is, outcome is a word with a broader meaning than backwash:

backwash: the consequences of an event (especially a catastrophic event)
outcome: a phenomenon that follows and is caused by some previous phenomenon

Other hypernyms of backwash include consequence, effect, event, issue, result, upshot.

backwash (noun)	outcome (noun)
the wave that spreads behind a boat as it moves forward	something that results
the flow of air that is driven backwards by an aircraft propeller	a phenomenon that follows and is caused by some previous phenomenon
the consequences of an event (especially a catastrophic event)