Gehena or Gehenna: How To spell?
The word Gehena is misspelled against Gehenna, a noun meaning "The valley of Hinnom, near Jerusalem, where some of the Israelites sacrificed their children to Moloch, which, on this account, was afterward regarded as a place of abomination, and made a receptacle for all the refuse of the city, perpetual fires being kept up in order to prevent pestilential effluvia. In the New Testament the name is transferred, by an easy metaphor, to Hell."
Gehenna has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings gehe & a which should not be misspelled with single 'N'
Wrong Spelling:  gehe-n-a  Correct Spelling:  gehe-nn-a 
Explore spell check of Gehenna to spell without errors.