waste matter vs waste product

waste matter and waste product both are nouns.

Word	Noun	Adjective	Verb	Adverb
waste matter	Yes	No	No	No
waste product	Yes	No	No	No

As nouns, waste matter and waste product are synonyms defined as:

waste matter and waste product: any materials unused and rejected as worthless or unwanted

Other synonyms of waste matter include waste, waste material.

waste matter (noun)	waste product (noun)
any materials unused and rejected as worthless or unwanted	any materials unused and rejected as worthless or unwanted