excrement vs excreta

excrement and excreta both are nouns.

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

As nouns, excrement and excreta are synonyms defined as:

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

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

excrement (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