The word metronymics 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: 23
Highest Scoring Words With Friends™ Play In The Letters metronymics
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Seven Letter Word Alert: (44 words)
cistern, citrons, coiners, comment, commits, cornets, cretins, crimson, cronies, cystine, erotics, etymons, incomer, incomes, inocyte, ironyms, memoirs, mentors, meronts, meronym, metonym, metrics, microns, mincers, minters, moisten, moister, moments, monster, mortise, myotics, norites, notices, octynes, orients, recoins, remints, section, society, stonier, triones, trionym, trisomy, triynes