grinder

noun

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