The term 'Loud Horn' can be represented by three different crossword solutions: KLAXON (6 letters), CLAXON (6 letters), and TUBA (4 letters). A KLAXON is an electric horn used as a warning signal, often found on ships and trains. A CLAXON is a type of KLAXON that produces a loud, harsh sound. A TUBA is a large brass instrument with a deep sound, commonly used in marching bands and orchestras. All three of these solutions refer to a loud sound, making them suitable for the term 'Loud Horn'.