The word archbishoprics 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: 30
Highest Scoring Words With Friends™ Play In The Letters archbishoprics
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Seven Letter Word Alert: (24 words)
abiosis, airship, barhops, biochip, bishops, boarish, boracic, carhops, casspir, cochair, corsair, harbors, hibachi, ischiac, isobars, isopach, pachisi, phobiac, phobias, phobics, prosaic, raspish, scoriac, scorias