The word hierarchically 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: 28
Highest Scoring Words With Friends™ Play In The Letters hierarchically
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Seven Letter Word Alert: (24 words)
achiral, acrylic, aircell, allayer, archaic, archeal, archery, caliche, calicle, cecally, chalice, charier, charily, chiller, ciliary, circler, clayier, clearly, hairier, helical, lyrical, racecar, railcar, rechill