caretaker vs custodian

caretaker and custodian both are nouns.

Word	Noun	Adjective	Verb	Adverb
caretaker	Yes	No	No	No
custodian	Yes	No	No	No

As nouns, custodian is a hypernym of caretaker; that is, custodian is a word with a broader meaning than caretaker:

caretaker: a custodian who is hired to take care of something (property or a person)
custodian: one having charge of buildings or grounds or animals

Other hypernyms of caretaker include keeper, steward.

caretaker (noun)	custodian (noun)
a custodian who is hired to take care of something (property or a person)	one having charge of buildings or grounds or animals
an official who performs the duties of an office temporarily