The word biosystematics 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: 25
Highest Scoring Words With Friends™ Play In The Letters biosystematics
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Seven Letter Word Alert: (75 words)
abioses, abiosis, abiotic, abscess, abscise, abysses, amoebic, ascites, atomics, atomise, bassets, bassist, biasses, biomass, biotest, biotics, biotite, bisects, bitsets, cambist, combats, cosiest, costate, cystoma, cytomas, cytosis, ecstasy, emacity, embassy, iambics, iambist, iceboat, icemass, imitate, mascots, meiosis, meiotic, miscast, miscite, missays, misseat, mitiest, mitoses, mitosis, mitotic, mosaics, mycoses, mycosis, myotics, mystics, obesity, oecists, satiety, scabies, seamost, seismic, siestas, sitcoms, society, somatic, somites, somitic, statice, statics, statism, stimies, stomate, stomies, stymies, symbiot, systems, taoists, testacy, titmice, tomcats