The word heterometaboly 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: 25
Highest Scoring Words With Friends™ Play In The Letters heterometaboly
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Seven Letter Word Alert: (60 words)
abetter, abettor, abortee, armhole, athlete, bathtoy, battery, battler, beamlet, beermat, belayer, betroth, blather, bleater, blether, bloater, bloomer, blotter, boomlet, bottler, breathe, breathy, bromate, brothel, earlobe, earthly, eyebath, eyebolt, eyehole, herblet, lathery, leather, loather, lottery, mottler, rathole, rebathe, reblame, rebloom, retotal, rootlet, tearoom, teether, telomer, theater, theatre, theorem, thereat, thereby, thereto, thermal, throaty, toolbar, tootler, totable, treelet, tremble, trembly, tremolo, yealmer