pathogenic vs pernicious

pathogenic

adj
  • Able to cause (harmful) disease. 

  • Consisting of harsh, percussive, nonverbal sounds. 

pernicious

adj
  • Causing much harm in a subtle way. 

  • Causing death or injury; deadly. 

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