The word spectrometer 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: 21
Highest Scoring Words With Friends™ Plays In The Letters spectrometer
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Seven Letter Word Alert: (54 words)
compere, compete, cotters, creeper, emoters, emperor, erecter, erector, meeters, mercers, meteors, pectose, porters, potters, premeet, presort, preterm, pretest, protect, protest, rectors, reerect, remeets, remorse, remoter, remotes, reports, reposer, rescope, rescore, respect, restore, retorts, retrees, rompers, rosette, rotters, scepter, sceptre, secrete, specter, spectre, spotter, steeper, steerer, stomper, teemers, teeters, tempers, tempest, tempore, tempter, treetop, tremors