The word heteroecious 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 heteroecious
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Seven Letter Word Alert: (49 words)
cheerio, chooser, chouser, cithers, coesite, coheirs, coheres, cohorts, cooties, coterie, cushier, echoers, ecotour, eeriest, erotics, erotise, etchers, etheric, heretic, heroics, heroise, heteros, hirsute, ostrich, outhire, rechose, recites, rehouse, reshoot, retches, retouch, rhotics, richest, riotous, scooter, scouter, secrete, seether, sheeter, shooter, shouter, soother, sootier, stourie, techies, torches, toucher, touches, trochee