The word taxonomically 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: 31
Highest Scoring Words With Friends™ Play In The Letters taxonomically
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Seven Letter Word Alert: (28 words)
aclinal, acyloin, alicant, alimony, allonym, anatomy, animacy, anomaly, axially, axolotl, axotomy, coalman, coatman, coaxial, coolant, laminal, loxotic, manilla, maxilla, moonlit, oomancy, taxonym, tollman, tonally, toolman, toxical, xylitol, xylonic