lividity vs livor mortis

lividity

noun
  • A livid area of skin, such as a bruise, or as is often found on cadavers. 

  • Livor mortis, suggillation. 

  • The state or quality of being livid. 

livor mortis

noun
  • A settling of the blood in the lower portion of the body, causing a purplish red discoloration of the skin, typically occurring after death. 

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