The word streptococci is playable in Words With Friends™, but 1 blank substituting for the letter 'c' is 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™ Plays In The Letters streptococci
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Seven Letter Word Alert: (36 words)
cooties, copiers, cotters, ectopic, erotics, isotope, poetics, poorest, porotic, portico, potters, potties, prootic, protect, protest, protist, risotto, ropiest, sceptic, scooper, scooter, scorpio, sootier, spotter, stooper, tictocs, tipster, tiptoer, tiptoes, tooters, tootsie, triceps, tricots, trisect, tropics, tropist