nonplus vs roil

nonplus

verb
  • To bewilder or perplex (someone); to confound, to flummox. 

noun
  • A state of bewilderment or perplexity. 

roil

verb
  • To annoy; to make angry; to throw into discord. 

  • To romp. 

  • To render turbid by stirring up the dregs or sediment of. 

  • To bubble, seethe. 

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