How to speak different kinds of waiters in English (for example, in hotels, supermarkets, banks, airports, gas stations, etc. , the more the better, thank you)

Waiter, hotel waiter; ; Waiter boy [disparaging] Hotel waiter, hotel (or restaurant) waiter, waiter; Office boy; Porters in hotels, railway stations, etc. Elevator worker; Trainee, courier, waiter, waiter, consular waiter, flight attendant (on a car, ship or plane) waiter, flight attendant