billowy vs swelling

billowy

adj
  • Swelling or swollen into large waves; full of billows or surges; resembling billows. 

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 billowy and swelling occurred in a corpus of books? (source: Google Ngram Viewer )