choking vs suffocation

choking

noun
  • The process in which a person's airway becomes blocked, resulting in asphyxia in cases that are not treated promptly. 

  • The act of coughing when a person finds it difficult to breath. 

  • The act of trying to kill a person by strangulation. 

suffocation

noun
  • Asphyxia—a condition in which an extreme decrease in the concentration of oxygen in the body accompanied by an increase in the concentration of carbon dioxide leads to loss of consciousness or death. 

  • A child left unattended may die of suffocation. 

  • A particular act of death or killing by means of asphyxia. 

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