excreting vs excretion

excreting and excretion both are nouns.

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

As nouns, excreting and excretion are synonyms defined as:

Other synonyms of excreting include elimination, evacuation, voiding.

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