corban vs self-sacrifice

corban

noun
  • An offering to God, especially in fulfilment of a vow. 

  • An alms basket; a vessel to receive gifts of charity; a treasury of the church, where offerings are deposited. 

self-sacrifice

noun
  • The act of making the ultimate sacrifice of giving up one's life for a cause. 

  • The giving up of one's own benefit for the good of others. 

How often have the words corban and self-sacrifice occurred in a corpus of books? (source: Google Ngram Viewer )