defecator vs voider

defecator and voider both are nouns.

Word	Noun	Adjective	Verb	Adverb
defecator	Yes	No	No	No
voider	Yes	No	No	No

As nouns, defecator and voider are synonyms defined as:

Other synonyms of defecator include shitter.

defecator (noun)	voider (noun)
(obsolete) that which cleanses or purifies; especially, an apparatus for removing the feculencies of juices and syrups.	a hamper that holds dirty clothes to be washed or wet clothes to be dried
a person who defecates	a piece of chain mail covering a place unprotected by armor plate
	an official who can invalidate or nullify
	a person who defecates