flagpole vs parapet

flagpole

noun
  • A tall pole up which one or more flags may be raised and flown. 

verb
  • Exit a country momentarily and reenter. Usually this is done to satisfy immigration requirements. 

parapet

noun
  • Part of a perimeter that extends above the roof. 

  • A fortification consisting of a wall. 

  • A low protective wall. 

  • Hyponym: balustrade 

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