Elysium vs eternity

Elysium

adj
  • of or pertaining to Elysium 

  • blissful; euphoric 

name
  • A region in the northern hemisphere of Mars. 

  • The home of the blessed after death. 

  • A place or state of ideal happiness; paradise. 

eternity

noun
  • Existence without end, infinite time. 

  • A period of time which extends infinitely far into the future. 

  • The remainder of time that elapses after death. 

  • Existence outside of time. 

  • A comparatively long time. 

How often have the words Elysium and eternity occurred in a corpus of books? (source: Google Ngram Viewer )