primary election vs summit

primary election

noun
  • A preliminary election to select a political candidate of a political party. 

summit

noun
  • A gathering or assembly of leaders. 

  • A peak; the topmost point or surface, as of a mountain. 

verb
  • To reach the summit of a mountain. 

pron
  • Something 

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