capstone vs finishing touch

capstone

noun

  • A crowning achievement, culmination or finishing touch. 

  • Any of the stones making up the top layer of a wall; a coping stone. 

verb

  • To complete as a crowning achievement; to top off. 

  • To train in the Capstone Military Leadership Program. 

finishing touch

noun

  • A final addition, change, or embellishment that serves to complete something. 

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