nullification vs termination

nullification

noun
  • The act of nullifying; a rendering void and of no effect, or no legal effect. 

  • The nullification crisis in U.S. history, confrontation between the state of South Carolina and the federal government in 1832–33 over the former's attempt to declare null and void within the state the federal Tariffs of 1828 and 1832. 

  • Surgical removal of genitals (and sometimes nipples) as a form of body modification; a person who has undergone this surgery is a nullo. 

termination

noun
  • The process of terminating or the state of being terminated. 

  • The last part of a word; an ending, a desinence; a suffix. 

  • An induced abortion. 

  • The process of firing an employee; ending one's employment at a business for any reason. 

  • An end in time; a conclusion. 

  • An end in space; an edge or limit. 

  • An outcome or result. 

  • The ending up of a polypeptid chain. 

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