The word hematologist 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: 20
Highest Scoring Words With Friends™ Play In The Letters hematologist
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Seven Letter Word Alert: (59 words)
aiglets, alights, altoist, atheism, atheist, atomise, egotism, egotist, elogist, galoots, gamiest, gasohol, gelatos, geostat, gestalt, ghettos, gliomas, glottis, goalies, goatish, gooiest, gothism, gothite, haglets, halites, hamlets, hoagies, hogties, holiest, homages, homiest, hostile, imagoes, isolate, latites, ligates, loathes, maltose, megahit, moolahs, mottles, mottoes, oolites, ooliths, osteoma, otolite, otolith, semilog, sigmate, sleight, stealth, stomate, stoolie, thistle, toilets, tomatos, toolset, tootles, tootsie