spin-off vs byproduct

spin-off and byproduct both are nouns.

Word	Noun	Adjective	Verb	Adverb
spin-off	Yes	No	No	No
byproduct	Yes	No	No	No

As nouns, spin-off and byproduct are synonyms defined as:

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

Other synonyms of spin-off include by-product.

spin-off (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