waiter vs worker

waiter and worker both are nouns.

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

As nouns, worker is a hypernym of waiter; that is, worker is a word with a broader meaning than waiter:

Other hypernyms of waiter include actor, doer.

waiter (noun)	worker (noun)
a person whose occupation is to serve at table (as in a restaurant)	sterile member of a colony of social insects that forages for food and cares for the larvae
a person who waits or awaits	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done