The term 'Sound of Shock' can be summarized by two crossword solutions: GASP (4 letters) and ZAP (3 letters). GASP is an expression of surprise or shock, usually accompanied by a sudden intake of breath. It is often used to express disbelief or dismay. ZAP is an informal term for a sudden, sharp sound, such as the sound of an electric shock. It is also used to describe a sudden, intense burst of energy or activity. Both words are commonly used to describe a sudden, unexpected event or reaction.