diagnostic vs logical

diagnostic

adj
  • Of, or relating to diagnosis. 

  • Characteristic of a particular disease. 

  • Serving to indicate or specify a particular item or thing within a group of similar things. 

  • Intended to assess a student's preexisting knowledge on the material being taught. 

noun
  • Any technique used in medical diagnosis. 

  • That by which anything is known; a symptom. 

  • Any tool or technique used to find the root of a problem. 

logical

adj
  • Of or pertaining to logic. 

  • In agreement with the principles of logic. 

  • Relating to the conceptual model of a system rather than its physical expression 

  • Reasonable. 

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