critter sitter vs pet sitter

critter sitter and pet sitter both are nouns.

Word	Noun	Adjective	Verb	Adverb
critter sitter	Yes	No	No	No
pet sitter	Yes	No	No	No

As nouns, critter sitter and pet sitter are synonyms defined as:

critter sitter and pet sitter: someone left in charge of pets while their owners are away from home

critter sitter (noun)	pet sitter (noun)
someone left in charge of pets while their owners are away from home	someone left in charge of pets while their owners are away from home