The word outriders 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: 11
Highest Scoring Words With Friends™ Play In The Letters outriders
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Seven Letter Word Alert: (26 words)
detours, dustier, editors, ioduret, outride, outside, retours, rioters, roisted, roister, routers, rudites, rustier, sortied, steroid, stirred, storied, stourie, strider, stridor, studier, tedious, tierods, tourers, trouser, turrids