What do the following words have in common?

1. Leather

2. Iron

3. Barrel

4. Lead 

5. Glass

6. Tin

7. Trick

8. Ring

9. Block

 

Answer:

 

Each word can precede a body part in a common expression:

 

1. Leatherneck (Marine)

2. Iron hand/stomach/lung

3. Barrel chest

4. Lead foot

5. Glass eye

6. Tin ear

7. Trick knee

8. Ring finger

9. Blockhead