The term 'dead center' is used to refer to the exact middle of something. In this case, it is referring to four words related to death: MORTUARY (8 letters), TOMB (4 letters), MORGUE (6 letters), and WAKE (4 letters). A MORTUARY is a place where dead bodies are prepared for burial or cremation. A TOMB is a structure that houses the remains of the deceased. A MORGUE is a place where dead bodies are stored and examined. Finally, a WAKE is a gathering of family and friends to remember and honor the deceased.