The word viscometer 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: 20
Highest Scoring Words With Friends™ Play In The Letters viscometer
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Seven Letter Word Alert: (38 words)
coesite, coterie, coverts, coveter, emetics, emoters, emotive, erosive, erotics, erotise, evictor, isomere, mercies, meteors, metrics, metrise, misvote, moister, mortise, motives, overset, oversit, recites, reemits, remotes, removes, restive, retimes, revoice, revotes, service, sievert, vectors, verismo, vetoers, victors, voicers, vomiter