The word reptilians 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: 15
Highest Scoring Words With Friends™ Play In The Letters reptilians
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Seven Letter Word Alert: (76 words)
airiest, airline, alpines, antlers, antsier, aplites, aspirin, elastin, entails, entraps, inertia, inspire, irisate, latrine, lintier, nailers, nailset, nastier, painter, palters, panters, panties, parents, parties, pastier, patines, pentail, pertain, pianist, piarist, pilates, pintail, pirates, pitiers, plainer, planers, planets, planter, plaster, platers, praline, pretans, pterins, ratline, realist, reliant, renails, rentals, repaint, replait, replans, replant, reslant, resplit, restain, retails, retains, retinal, retinas, salient, saltern, saltier, siltier, slatier, spaniel, spinier, stainer, stapler, sternal, tailpin, tiepins, tipsier, traipse, trenail, trepans, triples