server vs waiter

server and waiter both are nouns.

Word	Noun	Adjective	Verb	Adverb
server	Yes	No	No	No
waiter	Yes	No	No	No

As nouns, server and waiter are synonyms defined as:

server and waiter: a person whose occupation is to serve at table (as in a restaurant)

server (noun)	waiter (noun)
utensil used in serving food or drink	a person whose occupation is to serve at table (as in a restaurant)
(computer science) a computer that provides client stations with access to files and printers as shared resources to a computer network	a person who waits or awaits
a person whose occupation is to serve at table (as in a restaurant)
(court games) the player who serves to start a point