The word referendums 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™ Plays In The Letters
Seven Letter Word Alert: (30 words)
defense, defuser, demesne, demurer, emender, emersed, endures, ensured, ensurer, feeders, fenders, freemen, funders, menders, murders, needers, redeems, reefers, refeeds, refunds, refused, refuser, remends, renders, resumed, resumer, serener, sneered, sneerer, unfreed