The word backflowings 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: 32
Highest Scoring Words With Friends™ Play In The Letters backflowings
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Seven Letter Word Alert: (46 words)
agnosic, albinos, backing, backlog, balking, basking, bawling, bifocal, blowing, bowfins, bowling, cabling, clawing, closing, coaking, coalbin, coaling, confabs, cowling, cowskin, facings, falcons, flaking, flawing, flowing, foaling, fogbank, gablock, goblins, inflows, inlocks, kaolins, lacings, lacking, loafing, locking, oilcans, sacking, scaling, sickbag, slowing, soaking, socking, walking, walkins, wolfing