Where is the Greek word for 'hell' in the Bible?

Some believe the 3 Greek words translated to English as 'hell' are actually an interpolation - that is something added to or altering/corrupting with something foreign which in this case is an 'idea' of men. Be that as it may, there are 3 words translated as hell from the Greek. They are:

Hades - meaning unseen or grave or pit and is equivalent to 'sheol' in Hebrew.

Gehenna - valley of Hinnom and a burning city garbage dump.

Tartaroo/tartarus - a dark place of restraint for the fallen angels used one time in the Bible.

See link below