piece

noun:a portion of an object or of material, produced by cutting, tearing, or breaking the whole
- She cut a large piece of cake for her guest.
noun:an item of a particular type, especially one forming part of a set or collection
- This is a beautiful piece of antique furniture.
noun:a written, musical, or artistic work
- The composer played a short piece on the piano.
noun:a firearm, especially a pistol
- The detective always carried a piece for protection.