The word "decibel" is a unit of measurement that is commonly used to measure the intensity of sound. However, there are several other words that can be used as synonyms for "decibel." One of the most common alternatives is "sound level," which refers to the perceived volume of a sound. Another commonly used synonym is "acoustic intensity," which describes the strength of a sound wave. "Sonance" is yet another synonym that is frequently used to describe the loudness of a sound. Overall, there are many different words that can be used to describe the intensity of sound, and each one offers its own unique meaning and connotation.