The word optometrist 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: 17
Highest Scoring Words With Friends™ Play In The Letters optometrist
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Seven Letter Word Alert: (37 words)
imports, imposer, isotope, metrist, moister, mopiest, mortise, mottoes, omitter, oosperm, permits, poorest, potters, potties, primost, promise, promote, protest, protist, risotto, ropiest, sootier, spotter, stomper, stooper, tipmost, tipster, tiptoer, tiptoes, titters, tomtits, tooters, tootsie, topmost, toprims, totters, tropist