pact vs word of honor

pact

noun
  • An agreement; a compact; a covenant. 

  • An alliance or coalition. 

  • An agreement between two or more nations 

verb
  • To form a pact; to agree formally. 

word of honor

noun
  • A promise, or a pledge of one's good faith. 

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