The word microevolution 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: 27
Highest Scoring Words With Friends™ Play In The Letters microevolution
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Seven Letter Word Alert: (71 words)
citrine, cloture, contour, control, convert, coronet, coulter, counter, crouton, culvert, cutline, cutover, ecotour, elution, emotion, evictor, inciter, incomer, incurve, interim, inviter, invitro, invoice, ionomer, lection, limiter, lintier, loonier, meiotic, mintier, minuter, monitor, monocle, monocot, moonlit, moronic, motlier, mounter, mountie, numeric, olivine, omicron, oolitic, outcome, outlier, outline, outlive, outlove, outmove, overcut, overlit, recount, remount, retinol, rivulet, routine, runtime, termini, toolmen, tremolo, trounce, tumeric, turmoil, uncivil, uncover, uncrime, unrivet, violent, vitrine, vitriol, vomiter