heirloom vs throwback

heirloom

noun
  • An old crop variety that has been passed down through generations of farmers by seed saving and cultivation, in contrast to modern cultivars used in large-scale agriculture. 

  • A valued possession that has been passed down through the generations. 

throwback

noun
  • A reversion to an earlier stage of development. 

  • An atavism. 

  • An organism that has characteristics of a more primitive form. 

  • Coordinate terms: nowhere income, throwout 

  • A person considered to be primitive, uncivilized and mentally deficient. 

  • A person or thing that evokes memories. 

  • A practice to avoid untaxed nowhere income by instead taxing such income in the originating state for a given transaction. 

  • A person similar to an ancestor, or something new similar to what already existed. 

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