The word cherrystone is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 19
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (54 words)
cenotes, centers, centres, coherer, coheres, corners, cornets, echoers, encores, enocyte, erector, estrone, etchers, ethynes, eyeshot, heteros, honesty, hornets, necrose, neocyte, norther, notcher, notches, octenes, octynes, rechose, rectors, rectory, reentry, rehones, renters, rerents, rescore, reshore, restore, retches, rhetors, scenery, scenter, scorner, screeny, scyther, shorten, shorter, snorter, sorcery, stenchy, sterner, styrene, thereon, thrones, torches, trochee, yestern