earth closet vs longhouse

earth closet

noun
  • An outhouse or lavatory which uses a cesspit rather than a flush toilet and plumbing. 

longhouse

noun
  • A long communal housing of the Iroquois and some other American Indians, the Malaysians, the Indonesians, the Vikings, and many other peoples. 

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