The term 'THUNDEROUS NOISE' can be described by two crossword solutions: CLAP (4 letters) and ROAR (4 letters). Clapping is a sound made by striking the palms of the hands together, usually in a rhythmic pattern. Roaring is a loud, deep sound made by an animal or person, often to express anger or excitement. Both clapping and roaring are examples of thunderous noises that can be heard in many different contexts.