Muggle vs undead

Muggle

noun
  • A person who has no magical abilities. 

  • A person who lacks a particular ability or skill; a non-specialist; also, a person who is not a member of a group; an outsider or cowan. 

  • A person not involved in the pastime of geocaching. 

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. 

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