Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun by-product

2 senses of by-product

Sense 1
by-product, byproduct -- (a secondary and sometimes unexpected consequence)
       => consequence, effect, outcome, result, event, issue, upshot -- (a phenomenon that follows and is caused by some previous phenomenon; "the magnetic effect was greater when the rod was lengthwise"; "his decision had depressing consequences for business"; "he acted very wise after the event")

Sense 2
by-product, byproduct, spin-off -- (a product made during the manufacture of something else)
       => product, production -- (an artifact that has been created by someone or some process; "they improve their product every year"; "they export most of their agricultural production")