The word gametogenesis 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (93 words)
agonies, agonise, agonism, agonist, amongst, animose, atomise, easiest, eggiest, egoisms, egoists, egotism, emoting, enemies, engages, enigmas, esteems, gametes, gamiest, gassing, gatemen, geneses, genesis, genomes, geotags, gigaton, gnomist, goatees, imagoes, ingests, inmates, inseams, maggots, magneto, magnets, mangoes, massing, matinee, matings, meanest, meanies, meeting, megaton, meioses, menages, message, messing, mintage, misseat, mitogen, mitoses, moating, moisten, montage, mossing, negates, nemesis, nestegg, nosiest, onetime, onstage, sagiest, sateens, seaming, seamost, seating, seeming, segment, seitans, seitens, senates, sensate, sestina, sestine, siamese, siemens, sigmate, signage, signees, signets, somites, staging, stamens, stenose, stigmas, stogies, stomies, taggees, teaming, teasing, teeming, teenage, tossing