eternity vs extent

eternity

noun
  • Existence outside of time. 

  • Existence without end, infinite time. 

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

  • The remainder of time that elapses after death. 

  • A comparatively long time. 

extent

noun
  • A former tent; something (or someone) that was a tent but no longer is 

  • The valuation of property. 

  • A range of values or locations. 

  • A contiguous area of storage in a file system. 

  • The space, area, volume, etc., to which something extends. 

  • A writ directing the sheriff to seize the property of a debtor, for the recovery of debts of record due to the Crown. 

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