The word dinnertimes 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: 17
Highest Scoring Words With Friends™ Play In The Letters dinnertimes
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Seven Letter Word Alert: (60 words)
deities, dements, demerit, deniers, dentine, dentins, destine, diester, dieters, dieties, dietine, dimeter, dinners, dirties, ditsier, eminent, entries, indents, inditer, indites, insider, intends, intense, interim, interns, itemise, menders, merited, metrise, minders, mindset, minters, mintier, misedit, mistier, mitered, nitrene, nitride, reedits, reemits, remends, reminds, remined, remines, remints, rennets, retimed, retimes, sterned, stimied, tenders, tenners, termini, tidiers, timider, tinders, tinners, tinnier, tridems, trienes