broody vs sitter

broody and sitter both are nouns.

Word	Noun	Adjective	Verb	Adverb
broody	Yes	Yes	No	No
sitter	Yes	No	No	No

As nouns, broody and sitter are synonyms defined as:

Other synonyms of broody include brood hen, broody hen, setting hen.

broody (noun)	sitter (noun)
a domestic hen ready to brood	a domestic hen ready to brood
	a person engaged to care for children when the parents are not home
	an organism (person or animal) that sits
	a person who poses for a painter or sculptor

broody (adjective)	sitter (adjective)
physiologically ready to incubate eggs
deeply or seriously thoughtful