hominid vs hominin

hominid

noun
  • Any primate of the taxonomic family Hominidae, which includes all the great apes (chimpanzees, gorillas, orangutans) as well as humans. 

adj
  • Of the Hominidae. 

hominin

noun
  • Any member of the taxonomic tribe Hominini, the evolutionary group that includes modern humans and now-extinct bipedal relatives. 

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