grimace /grimˈəs or gri-māsˈ/

1. A distortion of the face, in fun, disgust, etc
2. A smirk

To make grimaces

grimˈacer noun

• sleeping pills
• sleeping policeman
• sleeping policemen
• sleepings
• sleeping sickness
• sleeping-suit
• sleeping-suits
• sleep learning
• sleepless
• sleeplessly
• sleeplessness
• sleeplessnesses
• sleep like a log
• sleep like a top
• sleep mode
• sleep modes
• sleep off
• sleep on
• sleep out
• sleepout
• sleepouts
• sleep over
• sleepover
• sleep rough
• sleepry