EW! is an interjection used to express disgust or disapproval. It is often used in response to something unpleasant, GROSS, or icky. ICK is a three-letter interjection used to express disgust or distaste. GROSS is a five-letter interjection used to express revulsion or repugnance. YUCK is a four-letter interjection used to express distaste or revulsion. All three terms are used to express a negative reaction to something.