hen vs sitter

hen and sitter both are nouns.

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

As nouns, sitter is a hyponym of hen; that is, sitter is a word with a more specific, narrower meaning than hen:

Other hyponyms of hen include cackler, brood hen, broody, broody hen, setting hen, mother hen, layer, pullet.

hen (noun)	sitter (noun)
adult female chicken	a domestic hen ready to brood
adult female bird	a person engaged to care for children when the parents are not home
female of certain aquatic animals e.g. octopus or lobster	an organism (person or animal) that sits
flesh of an older chicken suitable for stewing	a person who poses for a painter or sculptor