grimace /grimˈəs or gri-māsˈ/

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

To make grimaces

• rock melon
• rock melons
• rock music
• rock'n'roll
• rock'n'roller
• rock oil
• rock perch
• rock perches
• rock pigeon
• rock pigeons
• rock pipit
• rock pipits
• rock plant
• rock plants
• rock rabbit
• rock rabbits
• rock-ribbed
• rock rose
• rock roses
• rocks
• rock salmon
• rock salt
• rock scorpion
• rock scorpions
• rockshaft