clear as day vs thorough

clear as day

adj

  • Quite clear. 

thorough

adj

  • Utter; complete; absolute. 

  • Painstaking and careful not to miss or omit any detail. 

noun

  • A furrow between two ridges, to drain off the surface water. 

How often have the words clear as day and thorough occurred in a corpus of books? (source: Google Ngram Viewer )