hogan vs wurley

hogan

noun
  • A one-room Navajo dwelling or ceremonial lodge, constructed of wood and earth and covered with mud. 

wurley

noun
  • A settlement made up of such shelters. 

  • An Australian indigenous shelter made from small branches with the leaves still attached. 

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