elf vs ork

elf

noun
  • Any from a race of mythical, supernatural beings resembling but seen as distinct from human beings. They are usually delicate-featured and skilled in magic or spellcrafting; sometimes depicted as clashing with dwarves, especially in modern fantasy literature. 

  • A luminous spirit presiding over nature and fertility and dwelling in the world of Álfheim (Elfland). Compare angel, nymph, fairy. 

  • The bluefish (Pomatomus saltatrix). 

  • A very diminutive person; a dwarf. 

  • Any of the magical, typically forest-guarding races bearing some similarities to the Norse álfar (through Tolkien's Eldar). 

ork

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

  • Alternate spelling of orc. 

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