dung vs potash

dung

noun
  • A type of manure, as from a particular species or type of animal. 

  • Manure; animal excrement. 

verb
  • To release dung: to defecate. 

  • To immerse or steep, as calico, in a bath of hot water containing cow dung, done to remove the superfluous mordant. 

  • To discard (especially rubbish); to chuck out. 

  • To fertilize with dung. 

potash

noun
  • The water-soluble part of the ash formed by burning plant material; used for making soap and glass and as a fertilizer. 

  • A class of potassium minerals, of similar applicability to potassium carbonate, such as being a fertilizer. (ie. potassium chloride, potassium hydroxide) 

  • An impure form of potassium carbonate (K₂CO₃) mixed with other potassium salts. 

verb
  • To treat with potassium. 

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