steward vs curator

steward and curator both are nouns.

Word	Noun	Adjective	Verb	Adverb
steward	Yes	No	No	No
curator	Yes	No	No	No

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

steward (noun)	curator (noun)
someone who manages property or other affairs for someone else	the custodian of a collection (as a museum or library)
a union member who is elected to represent fellow workers in negotiating with management
one having charge of buildings or grounds or animals
an attendant on an airplane
the ship's officer who is in charge of provisions and dining arrangements