The word decommissioning 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: 29
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (92 words)
cession, codings, cognise, coining, comedos, comings, commend, commode, commons, condemn, condign, condoms, condone, consign, cosigns, cosines, cosmism, deicing, demoing, demonic, designs, diimine, dimming, dimness, dingies, diosmin, dissing, dominos, dooming, egoisms, endings, ensigns, eosinic, genomic, gnomons, godsons, goodies, goosies, iciness, iconism, imidine, incised, incises, incomes, indices, indigos, inosine, insides, iodines, iodises, iodisms, ionised, ionises, ionogen, ionones, isogons, meiosis, mendigo, mending, menisci, messing, mimesis, mincing, minding, minions, miscode, miscoin, misdoes, misdone, missing, mission, mnemons, monoids, mooning, mossing, noisome, nongods, noosing, nosodes, oncogen, oncosis, seconds, seismic, sending, sensing, sidings, sigmoid, sinoids, smidgen, smidgin, sodomic, somonis