morbific vs pathogenic

morbific

adj
  • Pertaining to or caused by disease; diseased. 

  • That causes disease; sickening, pathogenic. 

pathogenic

adj
  • Able to cause (harmful) disease. 

  • Consisting of harsh, percussive, nonverbal sounds. 

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