You’re indeed making up your own definition. Corpses are corpses, already dead, burning in Gehenna is still the first death, the process of dust returning to dust. The real second death is in the Lake of Fire, there’s no mention of Gehenna in Rev. 20-21. In Rev. 21:1 it says a NEW heaven and a NEW earth, the first has passed away, so how could such “corpses” still burn in the valley of Hinnom when the place has already passed away?
A study of Scripture reveals that the creation will be restored. The New Jerusalem is the current one restored. Isaiah 40 on is about the restoration.
For, behold, I create
new heavens and a
new earth:
And the former shall not be remembered, nor come into mind.
18 But be ye glad and rejoice for ever in that which I create:
For, behold, I create Jerusalem a rejoicing, and her people a joy.
19 And I will rejoice in Jerusalem, and joy in my people:
And the voice of weeping shall be no more heard in her, nor the voice of crying.
20 There shall be no more thence an infant of days,
Nor an old man that hath not filled his days:
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Is 65:17–20.
The Hebrew word translated "new" means, to make fresh, or to restore. Peter likewise speaks of this.
17 “Yet now, brethren, I know that you did it in ignorance, as did also your rulers. 18 But those things which God foretold by the mouth of all His prophets, that the Christ would suffer, He has thus fulfilled. 19 Repent therefore and be converted, that your sins may be blotted out, so that times of refreshing may come from the presence of the Lord, 20 and that He may send Jesus Christ, who was preached to you before, 21 whom heaven must receive
until the times of restoration of all things,
which God has spoken by the mouth of all His holy prophets since the world began. 22 For Moses truly said to the fathers.
The New King James Version (Nashville: Thomas Nelson, 1982), Ac 3:17–22.
See, the restoration of all things.
God has spoken of the restoration of all things through His holy prophets since the world began and Christians think they're going to Heaven. Doesn't that speak to the rampant Biblical illiteracy that exists today? The theme of restoration is all through the Bible, from Genesis to Revelation. Yet it's not preached in churches. Instead, they preach the Greek philosophic hope of Plato, ascending into the heavens.
And I saw a
new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea. 2 And I John saw the holy city, new Jerusalem, gcoming down from God out of heaven, prepared as a bride adorned for her husband. 3 And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God. 4 And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain:
for the former things are passed away. 5 And he that sat upon the throne said,
Behold, I make all things new.
The Holy Bible: King James Version, Electronic Edition of the 1900 Authorized Version. (Bellingham, WA: Logos Research Systems, Inc., 2009), Re 21:1–5.
Here we have a description of the new heavens and new earth from God Himself. He says the former things have passed away. Then He says, "Behold, I make all things new." Notice He didn't say He makes all new things. He said He makes all things new. That is restoration.
Gehenna is the second death. There are grave yards all over America full of people who died the first death and they weren't in Gehenna. There is no mention in Scripture anywhere of a Lake of Fire until we get to the book of Revelation, a book of symbolism. Jesus indicated that the wicked would be burned in Gehenna. Either John is describing Gehenna when he speaks of the Lake of Fire, or one of them is wrong.
So, your choices are, Gehenna and the Lake of fire are one and the same place, or Jesus is wrong, or John is wrong. Which option do you choose?