muscle
(a piece of flesh inside human or animal body that can tighten and relax to produce movement)
- I pulled a muscle in my back trying to lift the freezer.
- These exercises strengthen your muscles.
mussel
(a small shellfish with a soft body inside a black shell with two parts that close tightly together)
- Remove the mussels from their shells.
- What would you like to eat mussels or oysters?