drummer vs drummer pigeon

drummer

noun
  • One who plays the drums. 

  • A drumstick (the lower part of a chicken or turkey leg). 

  • A housebreaker. 

  • Any of various fish of the family Kyphosidae, which make a drumming sound. 

drummer pigeon

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