sitter vs hen

sitter and hen both are nouns.

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

As nouns, hen is a hypernym of sitter; that is, hen is a word with a broader meaning than sitter:

Other hypernyms of sitter include biddy.

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