The word heliotropes 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™ Plays In The Letters heliotropes
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Seven Letter Word Alert: (64 words)
elopers, epistle, erotise, estriol, helpers, heptose, heroise, heteros, holiest, holster, hoplite, hostile, hostler, isotope, loiters, loopier, looters, oolites, ooliths, orioles, pelites, pelters, perlite, petiole, petrels, petrols, philter, philtre, poetise, politer, poorest, pothers, pothole, repiles, repilot, replies, replots, reptile, reshoot, respelt, respite, resplit, respool, retiles, retools, ropiest, rosehip, roselet, shelter, shooter, slither, soother, sootier, spoiler, spooler, sterile, stoolie, stooper, strophe, toilers, toolers, topsoil, triples, tripole