The word cockfightings 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: 33
Highest Scoring Words With Friends™ Play In The Letters cockfightings
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Seven Letter Word Alert: (24 words)
choking, cocking, cockish, confits, costing, fiction, fishing, gifting, gnocchi, gnostic, gothics, hosting, iconist, insight, itching, knights, schtick, siccing, sicking, sifting, sighing, socking, stoking, ticking