discern vs mix up

discern

verb
  • To distinguish something as being different from something else; to differentiate. 

  • To perceive, recognize, or comprehend with the mind; to descry. 

  • To detect with the senses, especially with the eyes. 

  • To perceive differences. 

mix up

noun
  • A mix, blend, or variety. 

  • A confusion or reversal. 

verb
  • To become involved with, especially socially or romantically. 

  • To confuse or reverse. 

  • To prepare something from ingredients that are mixed. 

  • To shuffle. 

  • To combine thoroughly. 

  • To mix or blend thoroughly and completely. 

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