The word battleships 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: 20
Highest Scoring Words With Friends™ Play In The Letters battleships
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Seven Letter Word Alert: (38 words)
abseils, albites, aplites, ashiest, astilbe, atheist, baptise, baptist, batlets, battles, biphase, bitsets, halites, hapless, haplite, hatless, latites, libates, lipases, palsies, pastels, pasties, patties, petabit, pettish, phablet, pilates, pitless, plashes, spittle, stables, stalest, staples, stealth, tablets, theists, thistle, tipless