waiter vs carhop

waiter and carhop both are nouns.

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

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

Other hyponyms of waiter include counterperson, sommelier, wine steward, wine waiter, waitress.

waiter (noun)	carhop (noun)
a person whose occupation is to serve at table (as in a restaurant)	a waiter at a drive-in restaurant
a person who waits or awaits