The word biochemists 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™ Play In The Letters biochemists
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Seven Letter Word Alert: (21 words)
biotech, biotics, bisects, botches, chemist, cohibit, cosiest, homiest, meiosis, meiotic, miscite, mitoses, mitosis, oecists, seismic, sitcoms, somites, somitic, stimies, stomies, theisms