sitter vs biddy

sitter and biddy both are nouns.

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

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

Other hypernyms of sitter include hen.

sitter (noun)	biddy (noun)
a domestic hen ready to brood	young bird especially of domestic fowl
a person engaged to care for children when the parents are not home	adult female chicken
an organism (person or animal) that sits
a person who poses for a painter or sculptor