repeal vs undo

repeal

verb
  • To suppress; to repel. 

  • To recall; to summon (a person) again; to bring (a person) back from exile or banishment. 

  • To cancel, invalidate, annul. 

noun
  • An act or instance of repealing. 

undo

verb
  • To unfasten. 

  • To reverse the effects of an action. 

  • To impoverish or ruin, as in reputation; to cause the downfall of. 

noun
  • An operation that reverses a previous action. 

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