By-product as a noun is a secondary product; something made incidentally during the production of something else. while Byproduct as a noun is a secondary or additional product; something produced, as in the course of a manufacture, in addition to the principal product.
Part of speech: noun
Definition: A secondary product; something made incidentally during the production of something else. A side effect.
Part of speech: noun
Definition: A secondary or additional product; something produced, as in the course of a manufacture, in addition to the principal product.
We hope you now know whether to use By-product or Byproduct in your sentence.