excrement vs body waste

excrement and body waste both are nouns.

Word	Noun	Adjective	Verb	Adverb
excrement	Yes	No	No	No
body waste	Yes	No	No	No

As nouns, excrement and body waste are synonyms defined as:

excrement and body waste: waste matter (as urine or sweat but especially feces) discharged from the body

Other synonyms of excrement include excreta, excretion, excretory product.

excrement (noun)	body waste (noun)
waste matter (as urine or sweat but especially feces) discharged from the body	waste matter (as urine or sweat but especially feces) discharged from the body