busboy vs restaurant attendant

busboy and restaurant attendant both are nouns.

Word	Noun	Adjective	Verb	Adverb
busboy	Yes	No	No	No
restaurant attendant	Yes	No	No	No

As nouns, restaurant attendant is a hypernym of busboy; that is, restaurant attendant is a word with a broader meaning than busboy:

busboy: a restaurant attendant who sets tables and assists waiters and clears away dirty dishes
restaurant attendant: someone employed to provide service in a dining room

Other hypernyms of busboy include dining-room attendant.

busboy (noun)	restaurant attendant (noun)
a restaurant attendant who sets tables and assists waiters and clears away dirty dishes	someone employed to provide service in a dining room