The word hepadnavirus 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: 24
Highest Scoring Words With Friends™ Play In The Letters hepadnavirus
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Seven Letter Word Alert: (66 words)
adviser, airhead, anapsid, arshine, aspired, asunder, aupairs, dauphin, dervish, despair, dharnas, diapers, dishpan, durians, handers, handier, hardens, hardpan, harpies, headpin, heparin, hernias, hinders, insured, invader, invades, panders, parades, pariahs, phrased, pinhead, piranha, praised, prudish, purines, pushier, radians, raphids, ravines, rupiahs, sandier, saphena, sardine, saurian, shadier, sharped, sharpen, sharpie, shinpad, shrined, spiraea, spurned, unaired, undrape, unheard, unipeds, unpairs, unparse, unpaved, unsaved, unshare, upraise, uprisen, vapider, varnish, veranda