baby-sitter vs sitter

baby-sitter and sitter both are nouns.

Word	Noun	Adjective	Verb	Adverb
baby-sitter	Yes	No	No	No
sitter	Yes	No	No	No

As nouns, baby-sitter and sitter are synonyms defined as:

baby-sitter and sitter: a person engaged to care for children when the parents are not home

Other synonyms of baby-sitter include babysitter.

baby-sitter (noun)	sitter (noun)
a person engaged to care for children when the parents are not home	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