The word birdwatching 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: 27
Highest Scoring Words With Friends™ Plays In The Letters birdwatching
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Seven Letter Word Alert: (28 words)
abiding, arching, baiting, bathing, birding, bracing, carding, carting, catbird, chagrin, chiding, chinwag, crating, darting, dingbat, drawing, inhabit, itching, raiding, thawing, tracing, trading, triadic, waiting, warding, whiting, windbag, writing