The word micrometeorites 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: 24
Highest Scoring Words With Friends™ Play In The Letters micrometeorites
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Seven Letter Word Alert: (90 words)
coesite, commits, cooties, coterie, cotters, critter, crosier, eeriest, emetics, emitter, emoters, erecter, erector, erotics, erotise, immerse, isomere, itemise, itemset, meeters, meiotic, memetic, memoire, memoirs, mercers, mercies, meteors, metrics, metrise, metrist, mimetic, miscite, mistier, mistime, miterer, mitiest, mitotic, moister, mortise, mottoes, omitter, osmotic, reciter, recites, rectors, reemits, reerect, remeets, remorse, remoter, remotes, reroots, rescore, restore, retimer, retimes, retiree, retires, retorts, retrees, retries, retrims, rioters, risotto, roister, roomers, roomier, rooster, rooters, rosette, rotters, scooter, secrete, somitic, sootier, steerer, teemers, teeters, termite, testier, titmice, tomtoms, tooters, tootsie, tremors, tricots, trimers, trimmer, trireme, trisect