congregate vs dissipate

congregate

adj
  • Collective; assembled; compact. 

verb
  • To come together; to assemble; to meet. 

  • To collect into an assembly or assemblage; to bring into one place, or into a united body. 

dissipate

verb
  • To drive away, disperse. 

  • To use up or waste; squander. 

  • To vanish by dispersion. 

  • To cause energy to be lost through its conversion to heat. 

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