immurement vs incarceration

immurement

noun
  • Capital punishment, human sacrifice or life imprisonment by entombing for life or sealing behind walls. 

incarceration

noun
  • The act of confining, or the state of being confined; imprisonment. 

  • A constriction of the hernial sac, rendering it irreducible, but not great enough to cause strangulation. 

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