The word ambulances 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: 22
Highest Scoring Words With Friends™ Play In The Letters ambulances
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Seven Letter Word Alert: (22 words)
acumens, albumen, alumnae, ambsace, balance, baseman, bemauls, calamus, canulae, canulas, cubanes, encalms, lacunae, macules, manacle, manuals, mensual, nabales, nebulas, sunbeam, unbales, unlaces