bird of passage vs whaler

bird of passage

noun
  • Someone passing through a place and only staying for a short time; an itinerant. 

  • A migratory bird, especially a passage migrant (“a bird that stops somewhere for a short time during a seasonal migration”). 

whaler

noun
  • One who hunts whales; a person employed in the whaling industry. 

  • A large, strong person. 

  • Any shark of the family Carcharhinidae; a requiem shark. 

  • A seagoing vessel used for hunting whales. 

  • One who whales (flogs or beats). 

  • Something of unusually great size, a whopper, a whacker. 

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