grinder

(noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States. Synonyms: bomber, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep.

(noun) grinding tooth with a broad crown; located behind the premolars. Synonyms: molar.

(noun) machinery that processes materials by grinding or crushing. Synonyms: mill, milling machinery.

(noun) a machine tool that polishes metal.