trash vs waste matter

trash and waste matter both are nouns.

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

As nouns, waste matter is a hypernym of trash; that is, waste matter is a word with a broader meaning than trash:

Other hypernyms of trash include waste, waste material, waste product.

trash (noun)	waste matter (noun)
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant	any materials unused and rejected as worthless or unwanted
nonsensical talk or writing
worthless people
worthless material that is to be disposed of

trash (verb)	waste matter (verb)
express a totally negative opinion of
dispose of (something useless or old)