doorman vs hall porter

doorman

noun
  • A person who holds open the door at the entryway (entrance) to a building, summons taxicabs, and provides an element of security; in apartment buildings, he also accepts deliveries and may perform certain concierge type services. 

hall porter

noun
  • A hotel worker who carries luggage to the rooms of guests. 

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