The term whispered loudly can be summarized as 'HISSED' which is a 6 letter word. Hissing is a sound made by expelling air through the mouth and nose in a sharp, sibilant manner. It is often used to express disapproval or displeasure, or to scare away predators. It is also used to communicate with other animals, such as cats and snakes. Hissing is a common sound in nature, and it is also used in some human languages, such as Arabic and Hebrew.