dunny vs small room

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. 

small room

noun
  • A lavatory: a room intended for urination and defecation. 

  • Used other than figuratively or idiomatically: see small, room. 

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