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The word "key" it's a noun feminine that names the metallic instrument that is used to open or close a door. Can be used singular and plural. For example: I left you the keys under the planter.
It can also refer to the tool used to tighten or loosen nuts (Can these nuts be adjusted with this wrench?) or to the instrument that passes a fluid through a conduit (I never knew what the wrench that cuts the gas).