"grinder" in the noun sense

1. bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep

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

2. molar, grinder

grinding tooth with a broad crown located behind the premolars

3. mill, grinder, milling machinery

machinery that processes materials by grinding or crushing

4. grinder

a machine tool that polishes metal

Source: WordNet® (An amazing lexical database of English)

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