The word declivitous 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: 21
Highest Scoring Words With Friends™ Play In The Letters declivitous
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Seven Letter Word Alert: (47 words)
clouted, coedits, coldest, colitis, couldst, deistic, delicts, devious, diciest, dietics, dilutes, divulse, doilies, doviest, ductile, duelist, dulcets, elicits, eudicot, idolise, idolist, iodites, iolites, loudest, lucites, oculist, oiliest, outlies, outlive, outside, ovicide, oviduct, scouted, sidelit, sluiced, solicit, suicide, tedious, toluide, tousled, utilise, uveitis, vicious, violets, violist, visited, volutes