urine vs wee-wee

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. 

wee-wee

noun
  • Urine. 

  • The penis. 

  • The vulva or vagina. 

  • An act of urination. 

verb
  • to urinate 

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