The word crustlike 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 crustlike
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Seven Letter Word Alert: (25 words)
cluster, kilters, kirtles, lickers, lucites, luckier, lustier, restick, restuck, rickets, rutiles, sculker, slicker, sluicer, sticker, stickle, suckier, suckler, sulkier, tickers, tickler, tickles, trickle, truckle, tuckers