orc vs ork

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. 

ork

noun
  • Alternate spelling of orc. 

  • A species of aggressive, fungal humanoid alien, corresponding to the orcs in other fantasy works. 

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