The word bichromate 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: 21
Highest Scoring Words With Friends™ Play In The Letters bichromate
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Seven Letter Word Alert: (22 words)
aerobic, amoebic, biotech, botcher, brioche, bromate, bromite, chamber, chariot, chimera, cohabit, erotica, haricot, iceboat, matcher, microbe, octamer, rebatch, rematch, rhombic, thermic, thrombi