recapitulate vs spell out

recapitulate

verb
  • To summarize or repeat in concise form. 

  • (biology, of an organism) To mirror or repeat in analogous form, especially in reference to an individual's development passing through stages corresponding to the species' stages of evolutionary development. 

  • To reproduce or closely resemble (as in structure or function). 

spell out

verb
  • To explain in clear and simple terms; to be explicit. 

  • To form (a word) from letters; say the letters in a word. 

  • To replace an acronym with its expansion. 

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