proprietorship vs realty

proprietorship

noun
  • The state of being a proprietor; ownership 

realty

noun
  • The property that goes to the heirs of the deceased, as distinguished from the personalty, which goes to the executor or administrator of the estate. 

  • Real estate; a piece of real property; land. 

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