knock-on effect vs outcome

knock-on effect and outcome both are nouns.

Word	Noun	Adjective	Verb	Adverb
knock-on effect	Yes	No	No	No
outcome	Yes	No	No	No

As nouns, outcome is a hypernym of knock-on effect; that is, outcome is a word with a broader meaning than knock-on effect:

knock-on effect: a secondary or incidental effect
outcome: a phenomenon that follows and is caused by some previous phenomenon

Other hypernyms of knock-on effect include consequence, effect, event, issue, result, upshot.

knock-on effect (noun)	outcome (noun)
a secondary or incidental effect	something that results
	a phenomenon that follows and is caused by some previous phenomenon