The word symphonising 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: 26
Highest Scoring Words With Friends™ Plays In The Letters symphonising
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Seven Letter Word Alert: (24 words)
gnomish, gossipy, hissing, hymning, isonyms, isospin, minions, misship, missing, mission, mossing, myosins, nymphos, opining, phoning, pinions, poising, shining, siphons, sniping, spinons, spongin, syphons, yoginis