ancestry vs heirdom

ancestry

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

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

heirdom

noun
  • An inheritance or succession. 

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