The word hydrocarbons 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: 24
Highest Scoring Words With Friends™ Plays In The Letters hydrocarbons
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Seven Letter Word Alert: (26 words)
abscond, adhorns, anchors, archons, baryons, bradoon, broncos, byroads, candors, carbons, carboys, condors, corands, cordoba, cordons, coronas, crayons, hadrons, harbors, hobdays, hoorays, onboard, orchard, racoons, rancors, synarch