waiter's assistant vs busboy

waiter's assistant and busboy both are nouns.

Word	Noun	Adjective	Verb	Adverb
waiter's assistant	Yes	No	No	No
busboy	Yes	No	No	No

As nouns, waiter's assistant and busboy are synonyms defined as:

waiter's assistant and busboy: a restaurant attendant who sets tables and assists waiters and clears away dirty dishes

waiter's assistant (noun)	busboy (noun)
a restaurant attendant who sets tables and assists waiters and clears away dirty dishes	a restaurant attendant who sets tables and assists waiters and clears away dirty dishes