backwash vs event

backwash and event both are nouns.

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

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

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

backwash (noun)	event (noun)
the wave that spreads behind a boat as it moves forward	something that happens at a given place and time
the flow of air that is driven backwards by an aircraft propeller	a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory
the consequences of an event (especially a catastrophic event)	a phenomenon that follows and is caused by some previous phenomenon
	a special set of circumstances