The word cybernauts 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 cybernauts
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Seven Letter Word Alert: (31 words)
banters, becrust, betrays, bursate, butanes, butynes, canters, cauters, cautery, centaur, century, cubanes, curates, curtsey, encrust, estuary, eustacy, natures, nectars, nectary, nutcase, recants, saunter, scanter, subrace, trances, truancy, turbans, unbrace, uncarts, uncrate