The word cynocephalus 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: 28
Highest Scoring Words With Friends™ Play In The Letters cynocephalus
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Seven Letter Word Alert: (63 words)
accloys, acouple, alecups, cachous, cacoepy, calyces, calypso, cancels, capsule, chancel, chances, chapels, cheaply, cheapos, chylous, cleanup, cloches, closeup, coaches, cochlea, conceal, conches, couches, counsel, couples, cupolas, cyanose, cyclane, cyclase, cyclone, cyclops, cypsela, enclasp, epochal, euphony, halcyon, hauynes, housane, lunches, lynches, occluse, paunchy, phenols, phenyls, phoneys, poaches, pouches, pounces, punches, shapely, slouchy, specula, spyhole, syncope, uncapes, unclasp, unclose, unlaces, unleash, unplays, unsoapy, upscale, yaupons