prophet of doom vs spoilsport

prophet of doom

noun

  • a pessimistic person who sees possible calamity in every situation. 

spoilsport

noun

  • Someone who puts an end to others' fun, especially harmless fun. 

adj

  • Like a spoilsport. 

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