唔係呀,cooker係電飯褒, well sometimes you cannot ask why with a language itself, it's like how 駕駛飛機係flying a plane, and 飛行員係pilot, there is no reason for the use of words itself, english is not such a complicated language compared to chinese, but if you want to learn the language, there are certain rules that you have to memorize and of course there are certain exceptions too, so if there is anyone to blame, it would be the person who created the language itself