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Why do we call microwave ovens by the adjective, not the noun?

Most people know that microwave is short for microwave oven.

In English, we typically refer to things by the noun, not the adjective - for instance, we can call a green umbrella an umbrella, but not just 'a green'. Likewise, adjectives come before the noun in English.

I am pretty sure that microwave is the adjective and oven is the noun, since it is an oven that uses microwave radiation to cook food. Is there a particular reason we call 'microwave ovens' microwaves, or was that just to avoid confusion with a conventional oven?