byproduct vs outcome

byproduct and outcome both are nouns.

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

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

byproduct: a secondary and sometimes unexpected consequence
outcome: a phenomenon that follows and is caused by some previous phenomenon

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

byproduct (noun)	outcome (noun)
a product made during the manufacture of something else	something that results
a secondary and sometimes unexpected consequence	a phenomenon that follows and is caused by some previous phenomenon