fencepost vs parapet

fencepost

noun
  • A post which helps hold up a fence. 

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 fencepost and parapet occurred in a corpus of books? (source: Google Ngram Viewer )