lodgehouse vs porter's lodge

lodgehouse

noun
  • Synonym of lodge (“type of building”) 

porter's lodge

noun
  • A building for the porter(s) near the gate of a castle, college, etc., (historical) formerly used as a place of punishment for the staff. 

  • An equivalent room near the gate of a college, chiefly used as a mailroom. 

How often have the words lodgehouse and porter's lodge occurred in a corpus of books? (source: Google Ngram Viewer )