steward vs conservator

steward and conservator both are nouns.

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

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

steward (noun)	conservator (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	someone appointed by a court to assume responsibility for the interests of a minor or incompetent person
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