The term 'Sound of Pain' can be described by three words: GROAN (5 letters), MOAN (4 letters), and OUCH (4 letters). A GROAN is a low, deep sound made in response to physical or mental pain. It is usually involuntary and can be heard when someone is in distress. A MOAN is a similar sound, but it is usually softer and more drawn out. It is often used to express sorrow or discomfort. Finally, OUCH is an exclamation used to express sudden pain or discomfort.