baby-sitter vs babysitter

baby-sitter and babysitter both are nouns.

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

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

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

Other synonyms of baby-sitter include sitter.

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