The word rhinoviruses 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
Seven Letter Word Alert: (39 words)
envious, heinous, heroins, hissier, hornier, horsier, hosiers, hurries, inhouse, inshore, insurer, insures, ioniser, ionises, ironers, ironies, ivories, nervous, noisier, nourish, nursers, overrun, rinsers, rushers, seniors, serious, shiners, shinier, shivers, shovers, shrines, snorers, sourish, sunrise, unhorse, version, virions, viruses, visions