ancestry vs wellspring

ancestry

noun
  • A series of ancestors or progenitors; lineage, or those who compose the line of natural descent. 

  • Condition as to ancestors; ancestral lineage; hence, birth or honorable descent. 

wellspring

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

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

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