grinder

Short definition from Wiktionary

Noun

1. 1
   One who grinds something, such as the teeth.
2. 2
   A molar.
3. 3
   Any tooth.
4. 4
   Any of various machines or devices that grind things, such as by grinding them down or grinding them up: Any of various power tools with a spinning abrasive disc, used for smoothing, shaping, or deburring materials, usually metal.
5. 5
   Any of various machines or devices that grind things, such as by grinding them down or grinding them up: A grinding machine: any of various machine tools for grinding (either heavy or light grinding, but precise either way).
6. 6
   Any of various machines or devices that grind things, such as by grinding them down or grinding them up: Any of various pieces of heavy equipment for grinding.
7. 7
   A submarine sandwich, a sandwich made on a long, cylindrical roll.
8. 8
   A submarine sandwich, a sandwich made on a long, cylindrical roll: In particular, a submarine sandwich (hoagie) that is toasted or baked and typically does not contain lettuce.
9. 9
   A kitchen gadget for processing coffee, herbs etc. into small or powdered pieces.
10. 10
    The restless flycatcher (Myiagra inquieta) of Australia, which makes a noise like a scissors grinder.
11. 11
    A fan or performer of grindcore music.
12. 12
    A biohacker who uses cybernetic implants or biochemicals to enhance or change their own body.
13. 13
    A student who studies hard; a swot.
14. 14
    A person who coaches students for an upcoming examination.
15. 15
    A hard-working, physical player with limited offensive ability.
16. 16
    A low-ranking attorney with no clients who works very hard.
17. 17
    An outdoor space for drills and parades.
18. 18
    Atmospheric interference producing a roaring background noise.

Proper noun

1. 1
   A surname.