imperious vs pyramidal

imperious

adj

  • Urgent. 

  • Domineering, arrogant, or overbearing. 

pyramidal

adj

  • Tetragonal. 

  • Pyramid-shaped. 

noun

  • One of the carpal bones. 

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