deciding the legal effect of the words, there is no genuine factual issue left for a jury to decide." Planters Gin Co., 78 S. W.341 at 890 (citing 5 Joseph M. Perillo, Corbin on Contracts, 124.30 (rev. ed. 1998): Doe v. HCA Health Servs. of Tenn.. Inc.. 46 S.W.3d 191. 196 (Tenn. 2001)). The central tenet of contr