The word princeliest 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: 19
Highest Scoring Words With Friends™ Play In The Letters princeliest
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Seven Letter Word Alert: (87 words)
centers, centres, cistern, citrine, clients, cretins, crispen, eclipse, elicits, enteric, enticer, entices, entries, epistle, inciter, incites, inepter, inspect, inspire, irenics, lectern, lenites, license, lintier, pectens, pectins, pelites, pelitic, pelters, pencils, penlite, percent, perlite, petrels, picrite, pierces, pieties, pincers, pitiers, precent, precise, prelect, present, princes, pterins, receipt, recipes, recites, recline, reclips, relents, relines, repents, repiles, repines, replies, reptile, reslice, respect, respelt, respice, respite, resplit, retiles, scenter, scepter, sceptre, sericin, serpent, silence, siltier, sincere, specter, spectre, spicier, spinier, splenic, splicer, stencil, sterile, tensile, terpine, tiepins, tipsier, triceps, trienes, triples