The word cephalothin 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: 23
Highest Scoring Words With Friends™ Play In The Letters cephalothin
:
Seven Letter Word Alert: (38 words)
aconite, alethic, aloetic, capitol, caption, chaplet, cholate, choline, coalite, coalpit, ectopia, elation, epochal, ethanol, ethical, haplite, hepatic, hoplite, hotline, inplace, lactone, lection, nepotal, nepotic, opaline, optical, panicle, pelican, pentail, picante, pinhole, plicate, polecat, potiche, taphole, toenail, topical, topline