antelope vs sheep

antelope

noun
  • The pronghorn, Antilocapra americana. 

  • Any of several African mammals of the family Bovidae distinguished by hollow horns, which, unlike deer, they do not shed. 

sheep

noun
  • A woolly ruminant of the genus Ovis. 

  • The domestic Ovies aries, the most well known species of Ovis. 

  • Sheepskin leather. 

  • A timid, shy person who is easily led by others. 

  • A religious adherent, a member of a congregation or religious community (compare flock). 

  • A person who is easily understood by a speech recognition system; contrasted with goat. 

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