The word changeovers 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: 23
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (43 words)
acerose, achenes, anchors, archons, arsheen, avenger, avenges, canoers, careens, cargoes, carvone, caverns, changer, changes, charges, chevron, coarsen, coheres, corneas, corsage, echoers, encores, engrave, enrages, gnasher, governs, hangers, heavens, heavers, necrose, negroes, oranges, overage, oversea, ranches, reaches, recanes, rechose, rehangs, rehones, reshave, roaches, seagoer