The word antitussive 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: 17
Highest Scoring Words With Friends™ Plays In The Letters antitussive
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Seven Letter Word Alert: (27 words)
attunes, aunties, autists, instate, intuits, invests, invites, naivest, natives, seitans, sestina, sinuate, situate, statins, stative, statues, suavest, sustain, tautens, tetanus, tiniest, unities, unseats, uveitis, vainest, vastest, vitiate