The word alligatorfish 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: 22
Highest Scoring Words With Friends™ Play In The Letters alligatorfish
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Seven Letter Word Alert: (30 words)
aflight, afright, airfoil, airlift, alights, allstar, alright, ashfall, flights, florals, florist, frights, garfish, girlish, goatish, gorilla, harlots, largish, lariats, oarfish, oilfish, oligist, ragfish, ratfish, shallot, tailors, tallish, thralls, thrills, tigrish