The word serendipity 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™ Play In The Letters serendipity
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Seven Letter Word Alert: (65 words)
deities, deniers, density, despite, destine, destiny, diester, dieters, dieties, dietine, dirties, ditsier, entries, eyepits, inditer, indites, inepter, insider, inspire, nitride, pieties, pitiers, preedit, present, preside, pretend, printed, pterins, pyrites, reedits, repents, repined, repines, respite, retyped, retypes, ripened, riptide, serpent, spender, spidery, spindry, spinier, spirted, sterned, stipend, striped, stripey, styrene, syenite, tenders, tepider, terpine, tiderip, tidiers, tiepins, tinders, tindery, tipsier, trienes, tripeds, triynes, trypsin, yestern, yperite