The word athleticism 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: 20
Highest Scoring Words With Friends™ Play In The Letters athleticism
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Seven Letter Word Alert: (39 words)
achiest, aitches, alethic, atheism, atheist, calmest, castile, chalets, chattel, chemist, chilies, ciliate, climate, elastic, elicits, elitism, elitist, ethical, halites, hamlets, imitate, ischial, italics, laciest, laicise, latches, latites, lattice, malices, matches, metical, miscite, mitiest, satchel, statice, stealth, tactile, thistle, titmice