The word trophozoites 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 trophozoites
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Seven Letter Word Alert: (36 words)
hitters, hotpots, hotspot, isotope, oophore, oospore, ooziest, pettish, poorest, pothers, potshot, potters, potties, protest, protist, reshoot, risotto, ropiest, rosehip, shitpot, shooter, soother, sootier, spotter, stooper, strophe, thorite, tipster, tiptoer, tiptoes, tithers, tooters, tootsie, tropist, zithers, zootier