smotheration vs suffocation

smotheration

noun
  • Suffocation. 

  • A sailors' dish of meat buried in potatoes. 

suffocation

noun
  • A child left unattended may die of suffocation. 

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

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