decency vs filth

decency

noun
  • That which is proper or becoming. 

  • The quality of being decent; propriety. 

filth

noun
  • Smut; that which sullies or defiles the moral character; corruption; pollution. 

  • The police. 

  • Dirt; foul matter; that which soils or defiles. 

  • A vile or disgusting person. 

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