The word reductase 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (35 words)
austere, catered, cauters, cerates, creased, created, creates, crested, crudest, crusade, crusted, curated, curates, custard, dearest, decares, decrust, ductase, educate, eructed, euaster, reacted, reasted, recused, redacts, redates, reduces, reducts, rescued, sauteed, secured, sedater, seducer, tasered, traduce