comprehensive school vs intermediate school

comprehensive school

noun
  • a normal secondary school, accepting pupils of all abilities; replaced the secondary modern schools and grammar schools 

intermediate school

noun
  • A school for children that serves grades between elementary school and high school, and occasionally between the former and middle school. These grades vary from anywhere from grade 4 to grade 8. 

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