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What is the difference between chestnut and hazelnut?
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A chestnut is bigger than a hazelnut. Chestnut's are normally cooked before they are eaten.
They are nothing at all alike, except that they are both nuts. Look them up!
Yes - looking them up is a good idea - Google images has some very good pictures of both types of nut. You will be able to see the difference immediately although I couldn't find a picture of the together so that you can see the size difference.