IPA: /ˈdʌmˌweɪtə/
KK: /ˈdʌmˌweɪtər/
A small elevator that moves food or other items between different floors of a building.
The restaurant uses a dumbwaiter to send meals from the kitchen to the dining area on the upper floor.
Dumbwaiter → The word is formed from "dumb" (from Old English *dumb*, meaning unable to speak) and "waiter" (from Old French *waiter*, meaning to serve or to wait). A dumbwaiter is a device that serves food or goods, typically between floors, without the need for a person to carry them, hence the term 'dumb' indicating it operates without speech or human intervention.
Think of a device that serves ('waiter') without speaking ('dumb') — that's why a dumbwaiter is a machine that delivers items.
No commonly confused words.