The word hemoprotein 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 hemoprotein
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Seven Letter Word Alert: (30 words)
emotion, emptier, epitome, heroine, honoree, hormone, inepter, ionomer, monitor, moorhen, morphon, neither, onetime, phoneme, phonier, pimento, pioneer, pointer, portion, potheen, prenote, promote, protein, repoint, ropemen, tempore, terpine, theorem, therein, thereon