preamble vs preliminary

preamble

noun
  • A short preliminary statement or remark, especially an explanatory introduction to a formal document or statute. 

  • A syncword. 

verb
  • To speak or write a preamble; to provide a preliminary statement or set of remarks. 

preliminary

noun
  • A preparation for a main matter; an introduction. 

  • Any of a series of sports events that determine the finalists 

  • A relatively minor contest that precedes a major one, especially in boxing 

adj
  • In preparation for the main matter; initial, introductory, preparatory. 

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