The word semanticist 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (44 words)
amnesic, animist, ascents, ascites, caseins, catmint, cinemas, icemans, icemass, iciness, imitate, incests, incises, incites, inmates, inseams, insects, instate, menisci, miniate, miscast, miscite, misseat, mitiest, mittens, nematic, nictate, secants, seismic, seitans, sestina, simians, smitten, stamens, stances, statice, statics, statins, statism, stimies, tetanic, tiniest, titanic, titmice