aper vs chimpanzee

aper

noun
  • Someone who apes something 

chimpanzee

noun
  • Pan troglodytes, a species of great ape in the genus Pan, native to Africa, and believed by biologists to be the closest extant relative to humans along with the bonobo. 

  • A member of the genus Pan, including the bonobo which is also known as the pygmy chimpanzee. 

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