by-product vs byproduct

by-product and byproduct both are nouns.

Word	Noun	Adjective	Verb	Adverb
by-product	Yes	No	No	No
byproduct	Yes	No	No	No

As nouns, by-product and byproduct are synonyms defined as:

by-product and byproduct: a product made during the manufacture of something else

Other synonyms of by-product include spin-off.

As nouns, by-product and byproduct are synonyms defined as:

by-product and byproduct: a secondary and sometimes unexpected consequence

by-product (noun)	byproduct (noun)
a product made during the manufacture of something else	a product made during the manufacture of something else
a secondary and sometimes unexpected consequence	a secondary and sometimes unexpected consequence