The word endospores 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 endospores
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Seven Letter Word Alert: (28 words)
depones, deposer, deposes, depress, endorse, noosers, nosodes, openers, operons, persons, ponders, poroses, pressed, redness, reopens, reposed, reposes, resends, respond, senders, snooped, snooper, sooners, spender, spondee, sponsor, spooned, spoored