biped vs hominid

biped

noun
  • An animal, being or construction that goes about on two feet (or two legs). 

hominid

adj
  • Of the Hominidae. 

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

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