firedrake vs vishap

firedrake

noun
  • A fire-breathing dragon. 

  • A fiery meteor, an ignis fatuus, a rocket 

  • A kind of firework 

  • A worker at a furnace or fire 

vishap

noun
  • a dragon in Armenian mythology closely associated with water 

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