bleck vs poo

bleck

noun
  • Soot, smut. 

  • Any black fluid substance, as in blacking for leather, or black grease. 

  • Coalfish (Pollachius virens). 

poo

noun
  • Feces. 

  • Champagne. 

  • Cannabis resin. 

  • A poodle crossbreed. 

  • A piece of feces or an act of defecation. 

intj
  • Expressing annoyance, frustration, etc.: a minced oath for 'shit'. 

verb
  • To defecate. 

  • To dirty something with feces. 

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