Which word denotes something that is extremely loud and powerful?

The term "stentorian" is used to describe a sound that is extremely loud and powerful, often with a booming quality. It has its origins in the character Stentor from Greek mythology, who was known for his loud voice. In contexts where an intense or commanding presence is required, "stentorian" effectively conveys the idea of a sound that commands attention and fills a space with its volume.

The other options do not relate to loudness or power. "Stygian" refers to something dark or gloomy, often associated with the River Styx in mythology. "Sophistry" involves the use of fallacious reasoning or deceptive arguments, while "striated" pertains to markings or patterns, typically referring to lines or grooves, such as in crystallography or muscle tissue. Thus, "stentorian" stands out as the sole choice that encapsulates the concept of being extremely loud and powerful.