guano vs ordure

guano

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

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

ordure

noun
  • Dung, excrement. 

  • Dirt, filth. 

  • Something regarded as contaminating or perverting the morals; obscene material. 

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