strangling vs strangulation

strangling

noun
  • The crime of killing by strangling. 

strangulation

noun
  • The act of strangling or the state of being strangled. 

  • The constriction of the air passage or other body part that cuts off the flow of a fluid. 

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