polyp vs swelling

polyp

noun
  • An abnormal growth protruding from a mucous membrane. 

  • A cylindrical coelenterate, such as the hydra, having a mouth surrounded with tentacles. 

swelling

noun
  • The state of being swollen. 

  • Anything swollen, especially any abnormally swollen part of the body. 

  • A rising, as of passion or anger. 

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