The word religiousness 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (94 words)
egoless, elision, elogies, eloigns, elusion, engross, ensouls, ensures, genesis, genuses, girlies, girnels, glioses, gliosis, glories, glosser, glosses, greisen, grosses, grouses, guesser, guesses, gunless, gussies, igneous, ignores, ingress, insoles, insures, ioniser, ionises, ironies, issuers, issuing, leering, legions, leisure, lesions, lessens, lessons, lessors, lingers, lingoes, lioness, lionise, losings, lossier, lounger, lounges, lousier, lousing, negroes, noisier, origins, osseins, reeling, regions, regloss, reglues, regulon, reissue, relines, resigns, resoils, resoles, reusing, risings, roiling, rousing, rulings, seniors, sensors, serious, sessile, session, signees, signers, signors, singers, singles, sinless, sinuses, sirloin, sissier, slinger, soiling, soirees, sonless, souring, sunless, sunrise, surgeon, unreels, useless