orc vs orca

orc

noun
  • For more quotations using this term, see Citations:orc. 

  • A Russian soldier or gangster. 

  • A mythical evil monstrous humanoid creature, usually quite aggressive and often green. 

orca

noun
  • A sea mammal (Orcinus orca) related to dolphins and porpoises, commonly called the killer whale. 

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