body waste vs excreta

body waste and excreta both are nouns.

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

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

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

Other synonyms of body waste include excrement, excretion, excretory product.

body waste (noun)	excreta (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