sommelier vs wine waiter

sommelier and wine waiter both are nouns.

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

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

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

Other synonyms of sommelier include wine steward.

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