guano vs poo

guano

noun
  • Dung from a sea bird or from a bat. 

  • Coccothrinax borhidiana, a variety of palm tree indigenous to Cuba. 

poo

noun
  • Feces. 

  • Champagne. 

  • Cannabis resin. 

  • A poodle crossbreed. 

  • A piece of feces or an act of defecation. 

verb
  • To defecate. 

  • To dirty something with feces. 

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

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