The word incontestible 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: 22
Highest Scoring Words With Friends™ Play In The Letters incontestible
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Seven Letter Word Alert: (70 words)
betitle, betoils, binocle, biolite, biotest, biotics, biotins, biotite, bitcoin, boletes, bonelet, boneset, boniest, bonnets, botnets, bottles, cenotes, clients, coesite, colitis, consent, content, contest, ebonics, ebonies, elicits, elision, elitist, enclose, ennoble, entices, entitle, eosinic, iconist, incense, incites, incline, inlines, inosine, inosite, intense, intents, intones, iolites, lection, lenient, lenites, license, linnets, lionets, lionise, nettles, niobite, noblest, notices, obscene, octenes, oiliest, section, setbolt, silence, silicon, solicit, stencil, teleost, telnets, tensile, tension, tiniest, toilets