Harrow vs PLAN

Harrow

name
  • A prestigious public school for boys in the town of Harrow. 

  • A London borough of Greater London, England. 

  • A surname originating as an occupation for a harrower. 

  • A town in northwestern Greater London, England. 

PLAN

name
  • A particular standardized examination taken by high-school students. 

  • The People's Liberation Army Navy. 

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