facilities vs thunderbox

facilities

noun
  • Facilities for urination and defecation: a toilet; a lavatory. 

  • Synonym of facility in certain contexts. 

thunderbox

noun
  • Any lavatory or toilet, especially a rudimentary outdoor latrine or toilet, or an outhouse. 

  • A box of metal balls which is shaken to create a thunder sound effect. 

  • A chamber pot enclosed in a box; a portable commode. 

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