The term 'Sound of Lament' can be broken down into three crossword solutions: SIGH (4 letters), SOB (3 letters) and MOAN (4 letters). All three words refer to a sound made when expressing sorrow or grief. A SIGH is a deep, long breath that is often used to express relief, disappointment, or sadness. A SOB is a short, sharp sound made while crying, usually accompanied by tears. Lastly, a MOAN is a low, prolonged sound of distress or pain.