apnea vs choking

apnea

noun
  • The cessation of breathing, most often in reference to transient instances thereof during sleep. 

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. 

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