dumbfound vs nonplus

dumbfound

verb
  • To confuse and bewilder; to leave speechless. 

nonplus

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

noun
  • A state of bewilderment or perplexity. 

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