shitter vs defecator

shitter and defecator both are nouns.

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

As nouns, shitter and defecator are synonyms defined as:

Other synonyms of shitter include voider.

shitter (noun)	defecator (noun)
a person who defecates	(obsolete) that which cleanses or purifies; especially, an apparatus for removing the feculencies of juices and syrups.
	a person who defecates