felid vs sabre-toothed tiger

felid

noun
  • Any member of the cat family (Felidae). 

sabre-toothed tiger

noun
  • Any of numerous species of extinct cat-like mammals, of the Machairodontinae subfamily of the Felidae. 

How often have the words felid and sabre-toothed tiger occurred in a corpus of books? (source: Google Ngram Viewer )