As Byron said, there's multiple words in the Hebrew and Greek of the Old and New Testaments that the KJV lumps together with the one English word "Hell." First of all, there's no "Hell," in the way that Hollywood and some Churches would have you to believe. I'll have something prepared along these lines that'll give it a passage by passage breakdown for people EVENTUALLY, but with a Young's Concordance, if you're using the KJV, you'll be able to find out which are the passages that have "Gehenna" as the basis for what they're mistranslating as "Hell," which passages are "Hades" that they're mistranslating as "Hell," and which Passage is "Tartarus" that they're mistranslating as "Hell" in the New Testament. "Sheol" is the word mistranslated in the Old Testament as "pit," and "Hell."
From the Old Testament Hebrew word "Sheol" to the New Testament Greek word "Hades," these are direct translations of each other and are simply the English word "grave."
The Lake of Fire, or Tartarus, which is only called "Tartarus" once in one of Peter's epistles is mentioned in Matthew 25, 1Corinthians 5, and this passage in Revelation 20:14 that's been bothering you. Again, there's only one specific passage with the actual word "Tartarus" in the Greek text, but by comparing Scripture with Scripture, then you discern that this "Lake of Fire" is very simply the state of having all of your works burned away from your life that are unfit for the eternal glory that you're destined for in Christ. This does not necessitate afterlife punishment. This is the fire prepared for the devil and his angels with which God is burning away sinful acts and making one's life clean and cleared of all that would be unfit to pass down to future ages.
The passages regarding "Hell" that get mistranslated from the word "Gehenna," as you examine the context that that word "Gehenna" is used in each time that that particular Word is used, then you discover that it's the setting on fire of the course of your life by the tongue. It's the effects of false teaching, abuses of the tongue, abusiveness with the tongue, etc., and it's what comes upon your body and soul, children and disciples around you from what you speak and from the doctrine of your life that's weaved around your life from the songs, entertainment, teachings, and anything else involving words that's in your life that's unfit for eternal glory through Jesus Christ. Again, it's what burns in your body, soul, children that you influence, and any type of disciples of any kind that the course of your life would have, whether officially or unofficially. It's punishment that you receive from being around the wrong words. Jesus said that it's better to fall into the hands of someone that can destroy your body, as in the case of a terrorist, than to fall into the hands of him who can destroy both body and soul in Gehenna. The KJV will capitalize the "him," but Jesus immediately contrasted the "him" that He was talking about with the goodness of God in the same context. So, capitalizing the "him" in that context couldn't be accurate. An important concern about this, and between "Tartarus," and "Gehenna" is explained most of the suffering of the world -- but neither necessitate afterlife punishment.
And Sheol, or Hades is simply the grave or the state of the body between your death and your bodily resurrection by Jesus Christ so that you can enjoy life on the New Earth. Jesus Christ said about His soon coming crucifixion in John 12:31-33 that back then:
31. Now is come the judgment of this world. Now the prince of this world is cast out.
32. And I, if I be lifted up, I'll draw all men to Myself.
33. This He said indicating the type of death that He would die.
He wasn't just indicating the crucifixion by which He'd die, but the effects of the crucifixion being the judgment of the world, the prince of this world being cast out, and the drawing of all of mankind to Himself.
St. Paul said in 2Corinthians 5 that we must all appear before the judgment seat of Christ, because all of us were in Christ when He died. And through appearing before the judgment seat of Christ, whether we're good or bad, we'll receive the gratuity of grace according to Romans 5, because 2Corinthians 5 goes on to explain that God made Jesus to be sin for us, Who knew no sin, so that we'd be made the righteousness of God in Him. Each of us will receive the things that were done in His Body, whether we're good or bad, because it was for all of us.
There's a gnostic myth that many Churches function under of initiation before Christ will die for the person involved, that somehow only when you come to Christ of your own free will that only then will the crucifixion be for you. But that's an error because 1Corinthians 15:22 says that As in Adam all die, even so in Christ shall all be made alive.
Some will try to argue with this with their myth of cultic initiation into Christianity that they've borrowed from the gnostics that those "in Christ" are only the pious who've recognized their need for Him. But Colossians 1:15-20 says that all people were in Christ before they were in Adam. Romans 5 and 1Corinthians 15 are teaching us about the effects of the death of two men. That's the subject. That's the context within which we're to interpret the first and last Adam.
When Adam died, it was the death of all men. When Christ died, He died for all men; all were reckoned in Him according to 2Corinthians 5. Therefore, all will be made alive unto God through Jesus Christ. And the work of the Cross will work in each life BECAUSE it was for all men, and not because they were so wise and discerning before it was forever too late that they recognized their need for Him -- as though God were only providing under grace another "survival of the fittest" as people had in Old Testament times. As in the death of Adam all die, even so in the death of Jesus Christ all will be made alive. We're saved by His life, according to Romans 5, and according to His faith as both Romans and Galatians teach us. He in His High Priestly Ministry has set a date with each individual that He won't be late for. 1Timothy chapter 2 says that Jesus Christ being the ransom for all is the Good News that WILL BE testified IN DUE TIME, as though Paul were indicating that the fullness of this message wasn't necessarily for the understanding of his generation, although he was systematically laying down the foundation for it's understanding when the times of Visitation from the Presence of the Lord would fall upon the future ages, of which we're now a part of.
Jesus Christ will never give up on you or anyone that you've ever know of, in person or by reputation. He'll keep on seeking and saving the lost until the very last Prodigal Son has returned home. Revelation 5:13, speaking the end from the beginning of the book of Revelation, gives you a very beautiful picture of all beings in heaven, earth, under the earth, in the sea, and everywhere in between singing the praises of Jesus Christ and of our Father in heaven!
