The word tentacular 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 tentacular
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Seven Letter Word Alert: (22 words)
actuate, arcuate, canulae, canular, centaur, central, clatter, clutter, cutrate, lactate, lacunae, natural, neutral, nuclear, tactual, taunter, teacart, truncal, unalert, unalter, unclear, uncrate