The word philosophisers 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: 25
Highest Scoring Words With Friends™ Play In The Letters philosophisers
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Seven Letter Word Alert: (43 words)
hippies, hissers, hissier, hissies, hoppers, hoppler, hopples, hosiers, isohels, lessors, lippier, liriope, lispers, loopier, loppers, lossier, opposer, opposes, oppress, orioles, phisher, pissier, poopers, poroses, porosis, propels, propose, reships, resoils, respool, ripples, rosehip, shipper, shopper, sippers, sissier, slipper, slopers, sloshes, soppers, soppier, spoiler, spooler