The word juxtaposing 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: 34
Highest Scoring Words With Friends™ Plays In The Letters juxtaposing
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Seven Letter Word Alert: (23 words)
agonist, agoutis, anxious, guitjos, ousting, outgain, outings, outjinx, outsang, outspan, outspin, pasting, pausing, pigouts, posting, pouting, soaping, souping, spinout, stuping, tapings, utopian, utopias