reversal vs transformation

reversal

noun
  • The state of being reversed. 

  • A change in fortune; a change from being successful to having problems. 

  • An instance of reversing. 

adj
  • Intended to reverse; implying reversal. 

transformation

noun
  • The act of transforming or the state of being transformed. 

  • The alteration of a bacterial cell caused by the transfer of DNA from another, especially if pathogenic. 

  • The replacement of the variables in an algebraic expression by their values in terms of another set of variables; a mapping of one space onto another or onto itself; a function that changes the position or direction of the axes of a coordinate system. 

  • The transition from the apartheid era to a multiracial democracy in South Africa. 

  • A marked change in appearance or character, especially one for the better. 

  • A rule that systematically converts one syntactic form into another; a sentence derived by such a rule. 

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