The word subpopulation 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: 26
Highest Scoring Words With Friends™ Play In The Letters subpopulation
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Seven Letter Word Alert: (51 words)
albinos, appoint, autobus, bailout, bastion, boltons, botulin, butanol, laptops, lotions, niobous, nuptial, obtains, ooplast, options, outplan, outsail, outspan, outspin, outspun, platoon, plosion, plutons, poplins, potions, pulpits, slipout, spinout, splitup, stipula, subpial, subplot, subpool, subunit, tabooli, tobiano, topsail, topsoil, topspin, topspun, tubulin, unbaits, unbolts, unboots, unbuilt, unsplit, upbuilt, upsilon, upslant, utopian, utopias