There are many types of shells: eggshells, seashells, and the outer shell of beans, but all are a shelter for what is inside. “Sh!” not only means be quiet, but it also is shield against noise. Words that begin with “sh” also tend to relate to shade and shadows, as well as sunshine, which creates them both.
Words beginning with “sh”
What other words begin with “sh”?
What words end with “sh”?