The word telephonist 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™ Plays In The Letters telephonist
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Seven Letter Word Alert: (45 words)
entitle, epistle, epithet, epsilon, heptose, histone, holiest, hoplite, hostile, hotline, iphones, lenites, leptons, lionets, nettles, onestep, openest, pelites, penlite, pentose, peonies, petiole, petites, pettish, phenols, phonies, pinhole, pleions, poetise, poteens, potheen, potties, pottles, shitpot, spittle, spotlit, teleost, telnets, tensile, thiones, thistle, tinpots, tiptoes, toilets, topline