Guitar effects are devices used to modify the sound of an electric guitar. The four solutions for the term 'Guitar Effect' are Wawa (4 letters), Twang (5 letters), ECHO (4 letters), and Wahwah (6 letters). Wawa is a type of distortion effect that adds a fuzzy, warm sound to the guitar. Twang is a type of reverb effect that adds a bright, metallic sound to the guitar. ECHO is a type of delay effect that adds a repeating sound to the guitar. Wahwah is a type of filter effect that adds a sweeping, vocal-like sound to the guitar.