The word retinopathy 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: 19
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (30 words)
another, atrophy, entropy, hairnet, heparin, nattier, nitrate, operant, otarine, painter, panther, patient, patriot, pattern, pertain, phonier, pointer, portent, pottery, pronate, protean, protein, repaint, repoint, therapy, thorite, throaty, tiptoer, topiary, triptan