asphyxiation vs suffocation

asphyxiation

noun
  • Death due to lack of oxygen. 

  • An acute lack of oxygen. 

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 asphyxiation and suffocation occurred in a corpus of books? (source: Google Ngram Viewer )