The word reciprocities 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™ Plays In The Letters
Seven Letter Word Alert: (58 words)
coercer, coerces, coesite, copiers, correct, coterie, crisper, critics, crosier, ectopic, erector, erotics, erotise, icteric, pectose, picrite, piercer, pierces, pieties, pitiers, poetics, poetise, porters, precise, presort, pricers, pricier, receipt, recipes, reciter, recites, rectors, reports, reposer, reprice, reprise, rescope, rescore, respect, respice, respire, respite, restore, retires, retries, rioters, roister, ropiest, scepter, sceptic, sceptre, specter, spectre, spicier, striper, tipsier, triceps, tropics