The term 'sound of distress' can be described by a variety of words, each with five or fewer letters. GROAN (5 letters) is a low, deep sound made in pain or displeasure. SOB (3 letters) is a cry of sorrow or grief. YOWL (4 letters) is a loud, long, and mournful cry. YELP (4 letters) is a sharp, high-pitched cry, often made in pain or surprise. GULP (4 letters) is a swallow of liquid, usually done quickly or with difficulty. MOAN (4 letters) is a low, prolonged sound expressing physical or mental suffering. Ack (3 letters) is an expression of surprise, recognition, or dismay. GRUNT (5 letters) is a short, low sound made in the throat, usually to express disapproval or annoyance. All of these words are used to describe sounds of distress.