undead vs zed

undead

noun
  • A creature that is undead; that is, dead but still animate. 

  • Those creatures which are undead; that is, dead yet still animate. 

adj
  • Being animate, though non-living. 

  • Pertaining to a corpse, though having qualities of life. 

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 undead and zed occurred in a corpus of books? (source: Google Ngram Viewer )