ancestry vs clan

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. 

clan

noun
  • A group of people all descended from a common ancestor, in fact or belief, especially when the exact genealogies are not known. 

  • A traditional social group of families in the Scottish Highlands having a common hereditary chieftain 

  • Any group defined by family ties with some sort of political unity. 

  • A group of players who habitually play on the same team in multiplayer games. 

  • A badger colony. 

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