wine steward vs sommelier

wine steward and sommelier both are nouns.

Word	Noun	Adjective	Verb	Adverb
wine steward	Yes	No	No	No
sommelier	Yes	No	No	No

As nouns, wine steward and sommelier are synonyms defined as:

wine steward and sommelier: a waiter who manages wine service in a hotel or restaurant

Other synonyms of wine steward include wine waiter.

wine steward (noun)	sommelier (noun)
a waiter who manages wine service in a hotel or restaurant	a waiter who manages wine service in a hotel or restaurant