The term 'SOUND IN A POUND' can be solved by two four-letter words: 'YELP' and 'HOWL'. The word 'YELP' is often used to describe a short, sharp cry of pain or fear. It is also used to describe a high-pitched bark or yodel made by a dog or other animal. The word 'HOWL' is usually used to describe a long, loud, mournful cry made by an animal, especially a wolf. It can also be used to describe a loud, prolonged cry of pain, grief, or rage.