ancestry vs descent

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. 

descent

noun
  • Lineage or hereditary derivation. 

  • A particular extension of the idea of gluing. 

  • A falling upon or invasion. 

  • A sloping passage or incline. 

  • A drop to a lower status or condition; decline. 

  • An instance of descending; act of coming down. 

  • A way down. 

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