The word abecedarius 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™ Play In The Letters
Seven Letter Word Alert: (49 words)
abduces, abiders, abrades, abraids, abrased, acrasid, airbase, airbeds, arabise, arcades, ascarid, ascribe, beadier, because, bedares, braised, bruised, carbide, creased, cruised, crusade, daubers, dearies, debaser, decarbs, decares, decries, deicers, derbies, diabase, radices, readies, rebased, recused, reduces, rescued, residue, sabered, saucier, scabrid, scribed, seabird, secured, seducer, sidebar, sidecar, subarea, subrace, uricase