Hell or Hades

Over all it's a Mystery, but my theory is based on the Jewish Custom of Paradise, Luke16:19-31,

Some called this place Hades, (or Sheol OT)  which is the Greek translation of 'Hell' in KJV. However Hell, as we know it as the final place of the wicked is Gehenna, (the trash heap outside the city in valley of Hinnom)  This Word (wrongly translated Hell in KJV) used by Christ in Matt5:22, as punishment for insulting a person vehemently. Should change word Hell in following passages to Gehenna:

• Matt.5:22 whoever calls someone "you fool" will be liable to Gehenna.
• Matt.5:29 better to lose one of your members than that your whole body go into Gehenna.
• Matt.5:30 better to lose one of your members than that your whole body go into Gehenna.
• Matt.10:28 rather fear him who can destroy both soul and body in Gehenna.
• Matt.18:9 better to enter life with one eye than with two eyes to be thrown into Gehenna.
• Matt.23:15 Pharisees make a convert twice as much a child of Gehenna as themselves.
• Matt.23:33 to Pharisees: you brood of vipers, how are you to escape being sentenced to Gehenna?
• Mark 9:43 better to enter life with one hand than with two hands to go to Gehenna.
• Mark 9:45 better to enter life lame than with two feet to be thrown into Gehenna.
• Mark 9:47 better to enter the kingdom of God with one eye than with two eyes to be thrown into Gehenna
• Luke 12:5 Fear him who, after he has killed, has authority to cast into Gehenna
• James 3:6 the tongue is set on fire by Gehenna.

So to the Jews Hades, Sheol, or Abraham's bosom, was the temporary resting place of the dead, both righteous and wicked. Being separated by a huge gulf no one can cross over, as we are shown in the Luke passage. This is where Jesus descended during the three days before His bodily Resurrection, to speak with the OT Saints and then lead them into His abode with the Father. (Eph4:7-9)

Remember also that Peter, in his Pentecost address, Acts2:31, said of Christ that His Soul was not left in 'Hades',  (Miss translated in KJV as Hell)

It is necessary to distinguish between these words to understand the impact of all this. Although it's certainly not a Salvation issue or of absolute certainty.  

Note: In Rev20:14 the Lake of fire is also referring to Gehenna (which was always burning) the Word translation in the Rev passage is simply Pyr...Fire.