clod vs tubercle

clod

noun
  • A lump of something, especially of earth or clay. 

  • Part of a shoulder of beef, or of the neck piece near the shoulder. 

  • The ground; the earth; a spot of earth or turf. 

  • A stupid person; a dolt. 

verb
  • To collect into clods, or into a thick mass; to coagulate; to clot. 

  • To pelt with clods. 

  • To throw violently; to hurl. 

tubercle

noun
  • A small rounded wartlike protuberance of the roots of some leguminous plants; the lip of certain orchids, cacti. 

  • A small rounded nodule forming the characteristic lesion of tuberculosis. 

  • A round nodule, small eminence, or warty outgrowth, especially those found on bones for the attachment of a muscle or ligament or small elevations on the surface of a tooth. 

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