The word cardiologists 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 cardiologists
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Seven Letter Word Alert: (46 words)
aircool, astroid, carotid, castors, cladist, colitis, colossi, cordial, costars, cotidal, dialogs, diarist, digital, dilator, disroot, distils, doctors, dogcart, dogsits, dorsals, drastic, galoots, garlics, gastric, gliosis, idolist, italics, locator, oligist, oolitic, racists, rosalic, sailors, satiric, scorias, scrotal, silicas, socials, solicit, soloist, soricid, sortals, stoical, tailors, toroids, triadic