What does "busboy" mean?

An assistant waiter; one who clears plates from and cleans tables.

What is a synonym for "busboy"?

Common synonyms include: aquarius, barkeep, barkeeper, barmaid, barman, bartender.

/ˈbʌsˌbɔɪ/ noun

noun ·Uncommon ·Advanced level

Noun

1
An assistant waiter; one who clears plates from and cleans tables. US
2
a male restaurant attendant who sets tables and assists waiters and clears away dirty dishes wordnet

"Yanni's first job was a busboy."

Clipping of omnibus (“assistant waiter”) + boy.