cascade vs scuba diving

cascade

noun
  • A waterfall or series of small waterfalls. 

  • A stream or sequence of a thing or things occurring as if falling like a cascade. 

  • A pattern typically performed with an odd number of props, where each prop is caught by the opposite hand. 

  • A sequence of absurd short messages posted to a newsgroup by different authors, each one responding to the most recent message and quoting the entire sequence to that point (with ever-increasing indentation). 

  • A hairpiece for women consisting of curled locks or a bun attached to a firm base, used to create the illusion of fuller hair. 

  • A series of reactions in which the product of one becomes a reactant in the next 

  • A series of electrical (or other types of) components, the output of any one being connected to the input of the next; See also daisy chain 

verb
  • To fall as a waterfall or series of small waterfalls. 

  • To arrange in a stepped series like a waterfall. 

  • To occur as a causal sequence. 

scuba diving

noun
  • Underwater swimming using scuba equipment. 

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