The word poltergeist 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: 17
Highest Scoring Words With Friends™ Play In The Letters poltergeist
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Seven Letter Word Alert: (79 words)
egotist, egotrip, elegist, elegits, elogies, elogist, elopers, epilogs, epistle, erotise, estriol, glister, glitter, glories, glottis, goiters, goitres, goriest, gristle, letters, litters, loiters, pelites, pelters, perlite, petiole, petites, petrels, petrols, pettier, piglets, plotter, poetise, politer, portlet, potters, potties, pottles, pretest, protege, protest, protist, repiles, repilot, replies, replots, reptile, respelt, respite, resplit, retiles, retilts, retitle, ropiest, roselet, rosette, settler, slitter, spiegel, spittle, spoiler, spotlit, spotter, sterile, stilter, teleost, testier, tilters, tipster, tiptoer, tiptoes, toilers, toilets, treetop, trestle, triples, triplet, tripole, tropist