body of water vs wellspring

body of water

noun
  • Used other than figuratively or idiomatically: see body, of, water. 

  • Any significant accumulation of water, usually covering the Earth or another planet, such as an ocean, a river, lake or a bay. 

wellspring

noun
  • The source of water for a stream, spring or well; a fountainhead; a wellhead. 

  • A perennial source of anything; a fountainhead of supply or emanation; resource. 

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