bowel movement vs urine

bowel movement

noun
  • The discharge of feces from the body, an act of defecation. 

  • The feces thus produced. 

urine

noun
  • Liquid waste consisting of water, salts, and urea, which is made in the kidneys, stored in the bladder, then released through the urethra. 

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