The word hairsbreadth 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: 20
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (74 words)
abashed, abaters, abiders, abrader, abrades, abraids, abrased, abraser, abreast, airbase, airbeds, airdate, airhead, arabise, arbiter, aridest, artsier, astride, atresia, baiters, barista, barites, barters, bathers, bearish, bedirts, bestrid, birders, birthed, braider, braised, braiser, brasher, brasier, breadth, breaths, darters, dearths, diabase, disrate, dithers, hardest, hardhat, hardier, harsher, hastier, hatreds, hearths, herbist, rabider, radiate, raiders, rarebit, rebaits, rebaths, rebirth, rebraid, retards, seabird, shadier, shirted, sidebar, starred, stirred, strider, tardier, tarried, tarries, threads, tiaraed, tirades, traders, trashed, trasher