brood hen vs setting hen

brood hen and setting hen both are nouns.

Word	Noun	Adjective	Verb	Adverb
brood hen	Yes	No	No	No
setting hen	Yes	No	No	No

As nouns, brood hen and setting hen are synonyms defined as:

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

brood hen (noun)	setting hen (noun)
a domestic hen ready to brood	a domestic hen ready to brood