The word refractometer 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: 22
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (26 words)
amercer, armorer, caterer, crafter, creamer, creator, cremate, crofter, erecter, erector, forearm, fretter, octamer, reactor, recraft, recrate, reerect, refract, reframe, remoter, retrace, retract, retreat, terrace, tractor, treater