nonplus vs pull the rug (out) from under

nonplus

verb

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

noun

  • A state of bewilderment or perplexity. 

pull the rug (out) from under

How often have the words nonplus and pull the rug (out) from under occurred in a corpus of books? (source: Google Ngram Viewer )