The word destaining 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (29 words)
antigen, asinine, denting, dentins, destain, detains, dieting, dingies, dinting, editing, endings, gentian, ignited, ignites, indents, indians, indites, instead, intends, nesting, sainted, sanding, seating, sending, stained, teasing, tending, tensing, tidings