drummer vs percussionist

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. 

percussionist

noun
  • A trained musician who plays percussion instruments, as opposed to a drummer who lacks formal training. 

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