The word actinometry 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 actinometry
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Seven Letter Word Alert: (42 words)
aconite, acronym, amenity, anymore, anytime, carmine, catmint, cattery, cattier, certain, citator, citrate, cittern, cornett, cyanite, emacity, enactor, erotica, icetray, incomer, inocyte, marconi, minaret, moraine, nattier, nectary, nematic, nictate, nitrate, octamer, omitter, otarine, raiment, ricotta, romaine, romance, tantric, tetanic, tonearm, torment, trionym, tritoma