cross-purpose vs word salad

cross-purpose

noun
  • A contrary or conflicting purpose or understanding, especially an unintentional or misconceived one. 

word salad

noun
  • An intentionally nonsensical and voluminous statement. 

  • Meaningless text generated by a computer. 

  • A nonsensical assemblage of words, typical of schizophrenia, Wernicke's aphasia, and some other mental disorders. 

How often have the words cross-purpose and word salad occurred in a corpus of books? (source: Google Ngram Viewer )