addling vs cluttering

addling

noun
  • The act of causing fertilised eggs to lose viability, by killing the developing embryo within through shaking, piercing, freezing or oiling, without breaking the shell or other outer layer. 

cluttering

noun
  • The act of making, or condition of being, cluttered. 

  • A speech disorder characterized by fast, jerky, or irregular speech, which often sounds like stuttering. 

  • An instance of cluttered speech. 

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