The word heterogenesis 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 heterogenesis
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Seven Letter Word Alert: (98 words)
eeriest, egoists, eighter, engross, entrees, entries, erotise, estrone, ethenes, geneses, genesis, goiters, goitres, goriest, greisen, heiress, heroine, heroins, heroise, hessite, heteros, histone, hogties, hornets, horsing, hosiers, hosting, hotness, ignores, ingests, ingress, inserts, inshore, integer, negroes, neither, nesters, norites, nosiest, ogreish, orients, regents, regions, rehinge, rehones, reneges, renests, resents, reshine, reshoes, resight, resigns, resting, rosiest, seether, seethes, seitens, seniors, sestine, sheeter, shiners, shoeing, shoring, shorten, shrines, sighers, sighter, signees, signers, signets, signors, singers, sinters, soirees, sorties, sorting, stenose, stereos, stinger, stogies, stoners, stonier, stonish, stories, storing, strings, teenier, tensors, therein, thereon, thiones, thrones, throngs, tigress, tossing, treeing, trienes, triones