Mountain vs Portal

Mountain

name

  • A village in North Dakota, United States. 

  • A surname. 

  • The Montagnard party in the time of the French Revolution. 

  • A town in Wisconsin, United States. 

noun

  • a steam locomotive of the 4-8-2 wheel arrangement. 

Portal

name

  • A municipality of North Dakota. 

  • A surname. 

  • A town in Georgia, United States. 

  • A ghost town in California. 

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