grinder.

One who grinds something, such as the teeth.

scissors grinder (one who sharpens scissors)

A molar.

Any tooth.

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.

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).

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.

A sandwich made on a long, cylindrical roll.

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

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.

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

The restless flycatcher (Myiagra inquieta) of Australia, which makes a noise like a scissors grinder.

A fan or performer of grindcore music.

A biohacker who uses cybernetic implants or biochemicals to enhance or change their own body.

A student who studies hard; a swot.

A person who coaches students for an upcoming examination.

A hard-working, physical player with limited offensive ability.

A low-ranking attorney with no clients who works very hard.

An outdoor space for drills and parades.

Atmospheric interference producing a roaring background noise.