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Peeler
Kitchen Utensil
Remember 'peeler' refers to a kitchen tool, not the action of peeling. Don't confuse it with 'to peel'. 
Specific Design
'Peeler' often implies a handheld device designed for peeling, not any sharp object. 
Material Neutral
The word 'peeler' doesn't specify the material, it can be metal, plastic, or other materials. 