lividity vs lividness

lividity

noun
  • The state or quality of being livid. 

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

  • Livor mortis, suggillation. 

lividness

noun
  • The state or condition of being livid (dark or pallid). 

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