The word actinomyces 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 actinomyces
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Seven Letter Word Alert: (45 words)
accents, accites, aconite, actions, amenity, amnesic, amnesty, animose, anytime, ascetic, atomics, atomise, atonics, caconym, cations, cinemas, cocaine, cometic, conceit, concise, cyanise, cyanite, cyanose, cystine, cystoma, cytomas, emacity, etymons, icemans, incomes, inmates, inocyte, masonic, meconic, moisten, mycotic, myotics, nematic, notices, oceanic, octanes, octynes, section, society, somatic