The word abolitionists 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 abolitionists
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Seven Letter Word Alert: (24 words)
abiosis, albinos, altoist, bassoon, bastion, biotins, boltons, bonsais, initial, liaison, lotions, notists, oboists, obtains, sabinos, saloons, soloist, stanols, statins, station, tabooli, taoists, tobiano, tonsils