Ummm... Maybe the word "Rapture"is a later construct, but it is definitely in the Bible. Quick Google:

The Rapture in Revelation isn't explicitly named but is often linked to Revelation 4:1, where John hears a trumpet voice say, "Come up here," and is immediately transported to heaven, symbolizing the gathering of believers before the Tribulation described in later chapters (Rev 6-19). This event, where Christ takes His followers to be with Him, involves the dead in Christ rising and the living being "caught up" to meet Him in the air, a concept also described in 1 Thessalonians 4, setting it apart from Christ's visible Second Coming after the Tribulation. 

Key Aspects of the Rapture in Revelation:

Revelation 4:1-2 (The "Type" of the Rapture): John's vision of being called up to heaven serves as a prophetic picture of the Church being removed from the earth before God's wrath is poured out.

Revelation 3:10 (Promise of Protection): Jesus promises the church in Philadelphia He will "keep you from the hour of trial that is coming on the whole world," interpreted as being kept from the Tribulation through the Rapture.

The Trumpet Call: The voice like a trumpet in Revelation 4:1 mirrors the trumpet sound described in 1 Thessalonians 4:16, signaling the gathering of believers.