biped vs simian

biped

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

simian

noun
  • An ape or monkey, especially an anthropoid. 

adj
  • Bearing resemblance to an ape. 

  • Of or pertaining to apes; apelike. 

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