electoral college vs polling station

electoral college

noun
  • A body of electors empowered to elect someone to a particular office, such as the Holy Roman Emperor or the President of the United States. 

polling station

noun
  • a place where voters go to cast their ballot in an election or referendum; a voting station 

How often have the words electoral college and polling station occurred in a corpus of books? (source: Google Ngram Viewer )