custodian vs steward

custodian and steward both are nouns.

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

As nouns, custodian and steward are synonyms defined as:

custodian and steward: one having charge of buildings or grounds or animals

Other synonyms of custodian include keeper.

custodian (noun)	steward (noun)
one having charge of buildings or grounds or animals	someone who manages property or other affairs for someone else
	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