The word anisogamete 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: 17
Highest Scoring Words With Friends™ Play In The Letters anisogamete
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Seven Letter Word Alert: (63 words)
against, agamete, agatine, agatise, agnosia, agonies, agonise, agonism, agonist, amentia, amnesia, amongst, angioma, animate, animose, atomise, atonias, egotism, emanate, emoting, enigmas, gametes, gamiest, gateman, gatemen, genomes, gnomist, goatees, imagoes, inmates, magenta, magnate, magneto, magnets, manages, manatee, mangoes, matinee, matings, meanest, meanies, meeting, megaton, menages, mintage, mitogen, moating, moisten, montage, nametag, negates, onetime, onstage, sangoma, seaming, seating, seeming, segment, sigmate, stamina, teaming, teasing, teeming