Shudder means to vibrate, shake, or shiver from fear, revulsion, or cold.
- The severe air turbulence caused the airplane to shudder.
- I shudder to imagine where we will be if the measure fails.
Shutter is a screen or cover, or a movable cover for a window.
- A camera’s shutter is similar to a person’s eyelid.
- Jill closed the window shutters during the storm.