Here's why:
* Homograph: Words that are spelled the same but have different meanings and pronunciations.
* Homonym: Words that sound the same but have different meanings and may or may not be spelled the same.
"Leathes" can refer to:
* Leathes (surname): Pronounced /ˈliːθs/ (as in "lee-ths")
* The River Leathes: A river in Cumbria, England. Pronounced /ˈliːðs/ (as in "lee-ds")
Since the word "Leathes" has different pronunciations depending on its context, it fits the definition of a homograph.