Harrow vs Thaw

Harrow

name
  • A town in northwestern Greater London, England. 

  • A London borough of Greater London, England. 

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

  • A surname originating as an occupation for a harrower. 

Thaw

name
  • A river in South Wales which flows into the Bristol Channel at Aberthaw. 

  • A surname from Burmese. 

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