The term 'fall sound' refers to the sounds that are typically heard when something falls. The crossword solutions for this term are THUD (4 letters), CLUNK (5 letters), SPLAT (5 letters), PLOP (4 letters), KERPLOP (7 letters), and RAH (3 letters). THUD is a dull, heavy sound, usually made when something solid hits a surface. CLUNK is a loud, metallic sound, often made when two metal objects collide. SPLAT is a wet, squishy sound, usually made when something soft and wet hits a surface. PLOP is a light, hollow sound, usually made when something small and round hits a surface. KERPLOP is a combination of a THUD and a splash, usually made when something heavy and wet hits a surface. Finally, RAH is an exclamation of joy or triumph, often shouted when someone succeeds in achieving something.