backwash vs upshot

backwash and upshot both are nouns.

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

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

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

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