The term MOUSY NOISE can be summarized by the crossword solution SQUEAK, which is a 6 letter word. A SQUEAK is a high-pitched, short sound that is often associated with mice. It is also used to describe the sound of certain objects, such as rubber soles on a hard surface or a door hinge. Squeaks are usually produced by friction between two surfaces, and can also be caused by air passing through a small opening.