Then they should be Dutch.... "Serveerder" (males) or "Seveerster" (Female) are words that can be used in Dutch for a waiter. (although for male waiters the word "ober" is more common). "Serveerder/Seveerster" comes from the verb "serveren" which means "to serve"...
It's a really cool language, but also a hard language. Perhaps a good place to practice is the Foreign Language Stream (imgflip.com/m/ForeignLanguageMemes), as many foreign languages (including Dutch) pass by there. ;)