The word homeostatic 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: 19
Highest Scoring Words With Friends™ Plays In The Letters homeostatic
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Seven Letter Word Alert: (26 words)
achiest, aitches, atheism, atheist, atomics, atomise, cahoots, chamois, chemist, cooties, costate, homiest, matches, mooches, mottoes, ootheca, osmotic, osteoma, scotoma, somatic, statice, stomach, stomate, tomatos, tomcats, tootsie