The term FAN SOUND can be broken down into six crossword solutions: WHIRR (5 letters), WHIR (4 letters), JEER (4 letters), CLAP (4 letters), RAH (3 letters), and SHORTA (6 letters). WHIRR is a sound made by a fan or other machine, while WHIR is a similar sound. JEER is a loud, mocking laugh, often heard at sporting events. CLAP is the sound of two hands coming together in applause. RAH is an expression of enthusiasm or approval, usually shouted. SHORTA is a slang term for a fan, derived from the word 'SUPPORTER'.