ageing vs moribund

ageing

adj
  • UK, Australia, and New Zealand standard spelling of aging. 

noun
  • UK, Australia, and New Zealand standard spelling of aging. 

moribund

adj
  • Approaching death; about to die; dying; expiring. 

  • Almost obsolete, nearing an end. 

noun
  • A person who is near to dying. 

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