The word antimetabolite 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: 22
Highest Scoring Words With Friends™ Play In The Letters antimetabolite
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Seven Letter Word Alert: (49 words)
abalone, abettal, aeolian, ailment, aliment, ambiant, ambient, amentia, amiable, amoebae, animate, attelet, beamlet, betitle, bimetal, biolite, biotite, blatant, boatman, boatmen, bonelet, eatable, elation, emanate, enolate, entitle, imitate, labiate, laminae, lineate, maleate, manatee, matinee, miniate, monilia, netmail, niobate, niobite, notable, oatmeal, onetime, tabinet, tamable, teatime, tenable, timbale, toenail, tonette, totable