Found about a hundred and twenty times in the New Testament and used figuratively and literally, the Greek noun “thanatos” meant “death.”
Some crimes merit the penalty of death (Acts 25:11; Rom. 1:32). Those who do not commit such crimes are still subject to death (Rom. 5:12). Those who seek salvation must be baptized or immersed into the “death” of Jesus Christ (Rom. 6:3) so they can be raised to walk in the newness of life (Rom. 6:4) and be in the likeness of His resurrection (Rom. 6:5).
Sin pays a wage, and this wage is death (Rom. 6:23). The mind of the flesh results in “death” (Rom. 8:6). The Lord’s Supper (Acts 20:7) is a weekly reminder of Jesus’ “death” (1 Cor. 11:26). When Jesus returns at the end of time, death will be destroyed (1 Cor. 15:26). Until this time, sin and death cause a “sting” (1 Cor. 15:56). The Old Testament, and this includes the Ten Commandments, was a system of “death” because no one could perfectly keep the law (2 Cor. 3:7). Secular sorrow for sin instead of repentance brings about death (2 Cor. 7:10). Jesus became obedient to the point of “death” (Phil. 2:8) and is thus able to deliver people from death (2 Tim. 1:10), as well as the fear of death (Heb. 2:15). When people are old enough to be charged with sin (Jas 1:15), they experience spiritual death. Jesus “has the keys to death” (Rev. 1:18), and His people need to be faithful, even to the point of death (Rev. 2:10). There is a second death (hell) for the unsaved (Rev. 2:11). God’s wrath is so great men would prefer to face death (Rev. 9:6).