excreta vs excretion

excreta and excretion both are nouns.

Word	Noun	Adjective	Verb	Adverb
excreta	Yes	No	No	No
excretion	Yes	No	No	No

As nouns, excreta and excretion are synonyms defined as:

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

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

excreta (noun)	excretion (noun)
waste matter (as urine or sweat but especially feces) discharged from the body	the bodily process of discharging waste matter
	waste matter (as urine or sweat but especially feces) discharged from the body