The word trivialises 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (33 words)
airiest, airless, artless, estival, ileitis, ilvaite, irisate, liaises, realist, relists, resails, retails, revisit, sailers, saltier, salvers, satires, serials, servals, siltier, silvers, slaters, slatier, slavers, slivers, starves, stivers, stivier, strives, travels, trivial, verists, veritas