The word semipermeable 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™ Plays In The Letters semipermeable
:
Seven Letter Word Alert: (57 words)
amblers, ambries, amperes, balmier, bammers, beepers, bemires, beslime, besmear, blamers, bleeper, embalms, emblems, empires, epimers, immerse, impaler, impales, leapers, lempira, limbers, mailers, maimers, marbles, mealier, members, palmier, peelers, pleaser, preemie, prelims, premise, presale, primase, prismal, rambles, realise, realism, rebales, reblame, relapse, release, remails, repeals, repeels, repiles, replies, sampler, seamier, seeable, seepier, seriema, simpler, slammer, sleeper, slimmer, spammer