braille vs nipples

braille

verb
  • To write in, or convert into, the braille writing system. 

  • to identify something by touch. 

noun
  • A system of writing in which letters and some combinations of letters are represented by raised dots arranged in three rows of two dots each and are read by the blind and partially sighted using the fingertips. 

adj
  • Of, relating to or written in braille. 

nipples

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