The word platitudes 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: 16
Highest Scoring Words With Friends™ Play In The Letters platitudes
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Seven Letter Word Alert: (34 words)
aplites, details, dialups, dilates, dilutes, dispute, dualise, dualist, duelist, latites, lutites, palsied, patties, pilates, plaited, plastid, plaudit, pulsate, puttied, putties, saluted, situate, slatted, slitted, spatted, spitted, spittle, stapled, statued, stilted, stipula, stipule, updates, upstate