The word actinometer 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: 18
Highest Scoring Words With Friends™ Play In The Letters actinometer
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Seven Letter Word Alert: (53 words)
acetone, aconite, arenite, carmine, catmint, cattier, certain, citator, citrate, cittern, cornett, coterie, cremate, emirate, emitter, enactor, enteric, enticer, entreat, erotica, etaerio, incomer, iterate, marconi, matinee, meatier, minaret, miocene, moraine, nattier, nematic, nictate, nitrate, octamer, omitter, onetime, otarine, raiment, reenact, ricotta, romaine, romance, tantric, teatime, tentier, termite, ternate, tetanic, tonearm, torment, trainee, triaene, tritoma