The word tambourine 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (31 words)
ambient, arenium, baronet, bitumen, boatmen, bromate, bromine, bromite, brumate, enamour, minaret, minuter, moraine, mounter, mountie, muriate, neuroma, niobate, otarine, outearn, raiment, rainout, remount, romaine, routine, runtime, terbium, tonearm, tribune, turbine, urinate