steward vs custodian

steward and custodian both are nouns.

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

As nouns, steward and custodian are synonyms defined as:

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

Other synonyms of steward include keeper.

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