laborious vs pyramidal

laborious

adj

  • Industrious. 

  • Mentally difficult; painstaking. 

  • Requiring much physical effort; toilsome. 

pyramidal

adj

  • Tetragonal. 

  • Pyramid-shaped. 

noun

  • One of the carpal bones. 

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