IPA: /ˈkɔːfiˌmeɪkər/
KK: /ˈkɔfɪˌmeɪkər/
A device that makes coffee by heating water and passing it through ground coffee beans.
I bought a new coffeemaker that brews coffee in just five minutes.
Coffeemaker is formed from "coffee" (from the Arabic *qahwa*, meaning a type of beverage made from roasted coffee beans) and "maker" (from Old English *macian*, meaning to make or create). The word "coffeemaker" refers to a device that makes or brews coffee.
Think of a device that 'makes' ('maker') a special 'beverage' ('coffee') — that's what a coffeemaker does.