IPA: //ˈkʊkˌstoʊv//
KK: /kʊkstoʊv/
A device used for cooking food, typically consisting of a flat top and one or more burners.
She prepared dinner on the cookstove in the kitchen.
Cookstove → The word is formed from "cook" (from Old English *coc*, meaning to prepare food) and "stove" (from Old English *stofa*, meaning a heated room or place). A cookstove is a device used for cooking food in a heated space.
Think of 'cooking' ('cook') in a 'heated place' ('stove') — that's what a cookstove is used for.
No commonly confused words.