The word disinfection 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (41 words)
coedits, confide, confine, confits, consent, contend, deficit, deistic, dentins, diciest, diction, dietics, edition, eosinic, fiction, foisted, fondest, iconist, idiotic, incised, incited, incites, indents, indices, indicts, indites, infects, inosine, inosite, intends, intoned, intones, iodines, iodites, ionised, nondiet, noticed, notices, section, tendons, tension