Grinder

noun

1. One who grinds something, such as the teeth.
2. (anatomical) A molar.
3. A power tool with a spinning abrasive disc, used for grinding, smoothing, and shaping materials, usually metal.
4. A sandwich made on a long, cylindrical roll.

   "I am going to the deli to get a grinder for lunch."

5. A kitchen gadget for processing coffee, herbs etc. into small or powdered pieces