bellhop vs janitor

bellhop

noun
  • An employee of a hotel who carries a guest's luggage and runs errands. 

verb
  • To work as a bellhop. 

janitor

noun
  • Someone who looks after the maintenance and cleaning of a public building. 

  • A caretaker or custodian; someone who maintains a school building specifically and may serve other administrative roles. 

  • A doorman. 

  • A moderator for a discussion forum. 

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