The word dovetailing 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 dovetailing
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Seven Letter Word Alert: (55 words)
aligned, angioid, anilide, anviled, dealign, dealing, deaving, delving, deviant, dialing, dieting, digital, dogvane, editing, edition, elating, elation, eliding, evading, eviting, gelatin, genital, geoidal, glinted, gloated, godetia, ignited, ilvaite, intagli, invalid, invited, leading, leaving, ligated, lignite, loading, olivine, tagline, tailing, talonid, tangelo, tangled, tangoed, tingled, toenail, toiling, veiling, vetoing, vialing, vintage, violate, violent, violing, voiding, voltage