The term STARTLED SOUND can be represented by two crossword solutions, EEK (3 letters) and GASP (4 letters). EEK is an expression of surprise or fear, usually uttered in a high-pitched voice. It is often used to express shock or alarm. GASP is a sharp intake of breath, usually due to surprise or shock. It is often used to express surprise, fear, or astonishment. Both words are used to describe the sound made when someone is startled.