The word hemimetabolism is playable in Words With Friends™, but 1 blank substituting for the letter 'm' is 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™ Plays In The Letters hemimetabolism
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Seven Letter Word Alert: (44 words)
abolish, albites, alibies, astilbe, atheise, atheism, atomise, atomism, beamlet, beslime, betimes, betoils, bimetal, biolite, biolith, blemish, boletes, elitism, embalms, emblems, halites, hamlets, helmets, holiest, homiest, hostile, iambist, iolites, isolate, itemise, libates, loathes, maltose, mammoth, mismate, mistime, mobiles, mommies, oiliest, oleates, omelets, shamble, thimble, timbale