the bee's knees vs the bomb

the bee's knees

noun
  • Something or someone excellent, surpassingly wonderful, or cool. 

  • Used other than figuratively or idiomatically: see bee, -'s, knee. Corbiculae. 

the bomb

noun
  • A success; something excellent. 

  • The atomic bomb; the capability to launch a nuclear attack. 

How often have the words the bee's knees and the bomb occurred in a corpus of books? (source: Google Ngram Viewer )