vampire vs zed

vampire

noun
  • A mythological undead creature said to feed on the blood of the living. 

  • A medical technician who works with patients' blood. 

  • A person who drains one's time, energy, money, etc. 

  • A person with the medical condition systemic lupus erythematosus, colloquially known as vampirism, with effects such as photosensitivity and brownish-red stained teeth. 

  • Synonym of anti-ship missile (ASM), particularly an incoming hostile one. 

  • A blood-sucking bat; vampire bat (Desmodus rotundus) 

verb
  • To drain of energy or resources. 

zed

noun
  • A zombie. 

  • Something Z-shaped. 

  • The name of the Latin-script letter Z. 

  • Sleep. 

verb
  • To sleep or nap. (Compare zzz, catch some z's.) 

  • To zigzag; to move with sharp alternating turns. 

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