caretaker vs concierge

caretaker and concierge both are nouns.

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

As nouns, concierge is a hyponym of caretaker; that is, concierge is a word with a more specific, narrower meaning than caretaker:

caretaker: a custodian who is hired to take care of something (property or a person)
concierge: a French caretaker of apartments or a hotel; lives on the premises and oversees people entering and leaving and handles mail and acts as janitor or porter

Other hyponyms of caretaker include sacristan, sexton, super, superintendent, verger.

caretaker (noun)	concierge (noun)
a custodian who is hired to take care of something (property or a person)	a French caretaker of apartments or a hotel; lives on the premises and oversees people entering and leaving and handles mail and acts as janitor or porter
an official who performs the duties of an office temporarily