act of God vs miracle

act of God

noun
  • An unforeseen occurrence beyond one's control, such as a natural disaster. 

  • Used other than figuratively or idiomatically: see act, of, God. 

miracle

noun
  • An event that appears inexplicable by the laws of nature and so is held to be supernatural in origin. 

  • A fortunate outcome that prevails despite overwhelming odds against it. 

  • An awesome and exceptional example of something 

verb
  • To affect by a miracle; to work a miracle upon. 

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