The word calipering 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
Seven Letter Word Alert: (33 words)
airline, alginic, aligner, angelic, caliper, carping, ceiling, clinger, glacier, glancer, gracile, icepail, inplace, lairing, leaping, learing, pairing, panicle, pealing, pelagic, pelican, piecing, pingler, placing, plainer, praline, pricing, railing, realign, reaping, reclang, reicing, replica