waiter vs lurker

waiter and lurker both are nouns.

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

As nouns, lurker is a hyponym of waiter; that is, lurker is a word with a more specific, narrower meaning than waiter:

Other hyponyms of waiter include lurcher, skulker.

waiter (noun)	lurker (noun)
a person whose occupation is to serve at table (as in a restaurant)	someone waiting in concealment
a person who waits or awaits