48. Tribulation and Wrath - "Tribulation" refers to affliction (hardship or suffering) brought against God's people, either by life's circumstances or by evil forces, with "great tribulation" referring to end times troubles. "Wrath" refers to God's righteous anger against sin and evil.
49. Second Coming - The second coming refers to the personal, visible, bodily, victorious return of Jesus Christ to earth as King of kings and Lord of lords.
50. Millennium - The millennium (Latin for 1,000 years) refers to the reign of God's people - especially martyrs- either spiritually before Christ's second coming or else literally after His return but before the last judgment and the new creation.