The word heterospory 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 heterospory
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Seven Letter Word Alert: (28 words)
eophyte, eyeshot, eyespot, heptose, heteros, oophyte, poorest, porters, pothers, presort, reports, reposer, reroots, reshoot, reshore, restore, retypes, rhetors, rooster, rooters, shooter, shorter, soother, stooper, strophe, torpors, toyshop, trooper