regress vs reversion

regress

noun
  • The act of passing back; passage back; return; retrogression. 

  • In property law, the right of a person (such as a lessee) to return to a property. 

  • The power or liberty of passing back. 

verb
  • To move backwards to an earlier stage; to devolve. 

  • To move from east to west. 

  • To perform a regression on an explanatory variable. 

  • To interrogate a person in a state of trance about forgotten elements of their past. 

reversion

noun
  • The action of reverting something. 

  • The action of turning something the reverse way. 

  • The return of a genetic characteristic after a period of suppression. 

  • The fact of being turned the reverse way. 

  • The right of succeeding to an estate, or to another possession. 

  • The act of conversion to Islam, due to the belief that all people are born Muslim. 

  • The return of an estate to the donor or grantor after expiry of the grant. 

  • The action of returning to a former condition or practice. 

  • A sum payable on a person's death. 

  • The right of succeeding to an office after the death or retirement of the holder. 

  • An estate which has been returned in this manner. 

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