The word hailstones 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (40 words)
ashiest, elastin, elation, enlists, entails, ethanol, halites, hastens, hatless, histone, holiest, hostels, hostile, hotline, hotness, inhales, insoles, isohels, isolate, leantos, lesions, lioness, lionets, listens, loathes, nailset, nosiest, salient, salines, sealion, seitans, sestina, silanes, silents, stanols, stonish, thiones, tinsels, toenail, tonsils