The word countinghouse 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: 24
Highest Scoring Words With Friends™ Play In The Letters countinghouse
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Seven Letter Word Alert: (69 words)
cognise, congest, connote, consent, consign, cooties, costing, cushion, echoing, ensuing, etching, ethnics, eunuchs, gnostic, gooiest, gothics, gunshot, heinous, histone, hogties, hooting, hosting, housing, hunting, husting, igneous, inhouse, intones, ionogen, ionones, nesting, noncute, nonsuch, nonsuit, noosing, notches, nothing, notices, notions, oncogen, oogenus, ousting, outgoes, outguns, outgush, outings, outsung, section, shoeing, shooing, shotgun, sooting, stoning, suction, tensing, tension, tenuous, thiones, tongues, toonies, touches, toughen, toughie, tunings, uncouth, unction, unguent, unhinge, unstoic