The word centrifugal 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
Seven Letter Word Alert: (95 words)
aligner, angelic, article, auricle, cageful, cantref, careful, cartful, carting, cauline, centaur, central, certain, cingula, clinger, crating, curling, curtail, curtain, cutleaf, cutline, elating, eluting, engraft, failure, fainter, fancier, fatigue, fearing, felting, ferulic, figural, finagle, fireant, flaring, fluting, fragile, frantic, frigate, fueling, funeral, fungate, furcate, furling, furnace, gainful, gaunter, gelatin, genital, glacier, glancer, gracile, granite, granule, gruntle, gunfire, infarct, inflate, inflect, ingraft, ingrate, latrine, leafing, learing, lunatic, neutral, nuclear, rafting, rageful, ratline, realign, recital, reclang, refutal, reliant, retinal, ringlet, tagline, tailgun, tangier, tearful, tearing, tingler, tracing, trenail, truncal, turfing, unagile, unalert, unalter, unclear, uncrate, ungraft, uralite, urinate