The term FAN'S SOUND can be represented by four different words: WHIR (4 letters), RAH (3 letters), WHIRR (5 letters), and ROAR (4 letters). WHIR is a sound made by a fan or other machine with rotating blades, while RAH is an expression of enthusiasm or approval. WHIRR is a similar sound to WHIR, but is more prolonged. Finally, ROAR is a loud, deep sound, often associated with large animals such as lions. All of these words are used to describe the sound of a fan.