The word decommission 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: 23
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (42 words)
cession, comedos, commend, commode, commons, condoms, cosines, cosmism, demonic, dimness, diosmin, dominos, eosinic, iciness, iconism, incised, incises, incomes, indices, insides, iodines, iodises, iodisms, ionised, ionises, meiosis, menisci, mimesis, miscode, miscoin, misdoes, misdone, mission, monoids, noisome, nosodes, oncosis, seconds, seismic, sinoids, sodomic, somonis