The word phytochemists 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: 28
Highest Scoring Words With Friends™ Play In The Letters phytochemists
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Seven Letter Word Alert: (47 words)
cesspit, chemist, chipset, chymist, copyist, cosiest, cotypes, cytosis, hitches, homiest, hospice, imposes, isohyet, isotype, miscopy, misstep, mistype, mitoses, mopiest, mycoses, mycosis, myotics, mystics, oecists, pettish, physics, pitches, poetics, potiche, potties, psyches, psychos, scythes, septics, shitpot, sitcoms, society, somites, stomies, stymies, styptic, theisms, theists, timothy, tipmost, tiptoes, typists