defender vs steward

defender and steward both are nouns.

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

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

defender (noun)	steward (noun)
a person who cares for persons or property	someone who manages property or other affairs for someone else
a fighter who holds out against attack	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