Sorry, but hell cannot be the lake of fire, because,hell its thrown into the lake of fire, in Revelation. You can’t throw hell into hell.Both these words have been used INCORRECTLY in the KJV (which I use all the time).
Since Sheol/Hades is in the lower parts of the earth (or near the core of the earth) it cannot possibly be the grave (six feet under). And since Hell is Gehenna -- the Lake of Fire in "outer darkness" -- it cannot possibly be Sheol/Hades.
Rev 20:14 And death and hell were cast into the lake of fire. This is the second death.
And in the account of the rich man in hell and Luke chapter 16, hell is a compartment in the earth, separated by a great chasm from the paradise compartment in the earth.