Kitchen is one of the oldest rooms we have. A medieval castle might have a hall, kitchen, chambers, garderobe, etc. The terms Bedroom, Living Room and Bathroom is all later terms. So when the first kitchens were found and named as such we used the pronunciation at that time. So we did actually call it the cooking room, it was just pronounced kitchen by the Germanic tribes that came up with it. Later on the English language have changed a lot although that exact term have not changed very much. However the related term cooking have changed quite a bit although it is still recognizable to most Germanic languages.
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