The word inarguable 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: 18
Highest Scoring Words With Friends™ Play In The Letters inarguable
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Seven Letter Word Alert: (22 words)
airable, algebra, aligner, angular, banaler, bargain, bearing, blaring, blueing, blunger, brangle, bulgier, bungler, burling, granule, guarani, learing, lunaria, nebular, realign, regalia, unagile