or wait staff
a staff of waiters or waitresses who wait on tables, as in a restaurant.
a waiter or waitress.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for waitstaff
Waitstaff, whose hourly wages are a fairly trivial part of their compensation, will presumably just clock out and keep working.
Working stiffs like the waitstaff around us did not even enter into his calculation.
Online Etymology Dictionary, © 2010 Douglas Harper