outgrowth vs outcome

outgrowth and outcome both are nouns.

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

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

outgrowth: a natural consequence of development
outcome: a phenomenon that follows and is caused by some previous phenomenon

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

outgrowth (noun)	outcome (noun)
a natural prolongation or projection from a part of an organism either animal or plant	something that results
the gradual beginning or coming forth	a phenomenon that follows and is caused by some previous phenomenon
a natural consequence of development