prospectus vs synopsis

prospectus

noun
  • A document which describes a proposed endeavor (venture, undertaking), such as a literary work (which one proposes to write). 

  • A booklet or other document giving details of a share offer for the benefit of investors. 

  • A document, distributed to prospective members, investors, buyers, or participants, which describes an institution (such as a university), a publication, or a business and what it has to offer. 

synopsis

noun
  • A brief summary of the major points of a written work, either as prose or as a table; an abridgment or condensation of a work. 

  • A prayer book for use by the laity of the church. 

  • A reference work containing brief articles that taken together give an overview of an entire field. 

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