blotch vs tubercle

blotch

noun
  • A dark spot on the skin; a pustule. 

  • An irregularly shaped area. 

  • An uneven patch of color or discoloration. 

  • A bright or dark spot on old film caused by dirt and loss of the gelatin covering the film, due to age and poor film quality. 

  • Blotting paper. 

  • Any of various crop diseases that cause the plant to form spots. 

  • Imperfection; blemish on one’s reputation, stain. 

verb
  • To develop blotches, to become blotchy. 

  • To mark with blotches. 

tubercle

noun
  • 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. 

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

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