dunny vs undercroft

dunny

noun
  • Any other place or fixture used for urination and defecation: a latrine; a lavatory; a toilet. 

adj
  • Somewhat deaf, hard of hearing. 

  • Slow to answer: stupid, unintelligent. 

  • Somewhat dun, dusky brownish. 

undercroft

noun
  • A cellar or vaulted storage room. 

  • A ground-level car park that occupies the base of a building. 

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