The word perfluorocarbon 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: 30
Highest Scoring Words With Friends™ Play In The Letters perfluorocarbon
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Seven Letter Word Alert: (44 words)
acouple, baneful, blooper, bluecap, blurrer, boolean, bouncer, careful, caroler, carpool, cleanup, colorer, corneal, coronal, coroner, corpora, coupler, crooner, curable, flareup, flounce, forbear, forlorn, funeral, furnace, laborer, nebular, nuclear, parlour, placebo, polaron, pouncer, prancer, precool, procure, profane, proofer, purfler, rancour, recolor, reproof, rubeola, unbrace, unclear