frown, glower, lour, lower, mop, moue, mow, pout, smile, squinch, squint, wince.
decigrams, mischarge, scrimmage, screaming, grimacers.
Your query has returned 281 words, which include anagrams of grimaces as well as other shorter words that can be made using the letters included in grimaces.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.