steward vs fiduciary

steward and fiduciary both are nouns.

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

As nouns, fiduciary is a hypernym of steward; that is, fiduciary is a word with a broader meaning than steward:

steward (noun)	fiduciary (noun)
someone who manages property or other affairs for someone else	a person who holds assets in trust for a beneficiary
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

steward (adjective)	fiduciary (adjective)
	relating to or of the nature of a legal trust (i.e. the holding of something in trust for another)