gatehouse vs guesthouse

gatehouse

noun
  • A lodge besides the entrance to an estate; often the residence of a gatekeeper; also a dwelling formerly used as such a residence. 

  • A shelter for a gatekeeper. 

guesthouse

noun
  • A small house near a main house, for lodging visitors. 

  • A private house offering accommodation to paying guests; a boarding house; a bed and breakfast. 

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