mountain vs tumulus

mountain

noun
  • An elevation of land of considerable dimensions rising more or less abruptly, forming a conspicuous figure in the landscape, usually having a small extent of surface at its summit. 

  • A difficult task or challenge. 

  • Something very large in size or quantity; a huge amount; a great heap. 

  • Wine from Malaga made from grapes that grow on a mountain. 

  • A woman's large breast. 

  • The twenty-first Lenormand card. 

tumulus

noun
  • A mound of earth, especially one placed over a prehistoric tomb; a barrow. 

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