The word subpopulations 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: 27
Highest Scoring Words With Friends™ Play In The Letters subpopulations
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Seven Letter Word Alert: (82 words)
albinos, appoint, aulists, autobus, bailout, bassoon, bastion, boltons, bonsais, botulin, butanol, insults, laptops, lotions, niobous, nuptial, oboists, obtains, ooplast, options, outplan, outsail, outspan, outspin, outspun, passion, passout, pisspot, pistols, pistons, platoon, plosion, plutons, poisons, poplins, postils, potions, pulpits, sabinos, saloons, sinuous, slipout, slipups, soloist, spinals, spinous, spinout, splints, splitup, spousal, stanols, stipula, sublist, subpial, subplot, subpool, subslot, subsoil, subunit, sultans, sunspot, sustain, tabooli, tobiano, tonsils, topsail, topsoil, topspin, topspun, tubulin, unbaits, unbolts, unboots, unbuilt, unlists, unsplit, unstops, upbuilt, upsilon, upslant, utopian, utopias