What do the following pairs of words have in common?

1. Metal - Guide

2. Coil - Breeze

3. Pig - Plant

4. Coiled - Injury

5. Bird - Went headfirst 

Answers:

 

They are heteronyms - one-syllable words that are pronounced differently and have different meanings:

 

1. LEAD

2. WIND

3. SOW

4. WOUND

5. DOVE