The word parvoviruses 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 parvoviruses
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Seven Letter Word Alert: (51 words)
arouser, arouses, arrives, aspirer, aspires, avivore, ovaries, paresis, parsers, passive, poseurs, pourers, praiser, praises, provers, pursers, pussier, raisers, raspers, raspier, repairs, repours, resorps, saviors, saviour, savorer, savours, savvier, savvies, serious, serovar, sierras, soapers, soapier, soarers, soupier, sparers, sparser, spireas, survive, suspire, upraise, uprears, upriser, uprises, upriver, uproars, vaporer, vapours, various, viruses