capitonym /KAP-i-toh-NIM/. noun. A word that changes meaning (and sometimes pronunciation) when capitalized, such as August and august, Earth and earth, Polish and polish. A portmanteau of capital + -onym (word or name).
“An herb store owner, name of Herb,
Moved to rainier Mt. Rainier,
It would have been so nice in Nice,
And even tangier in Tangier.”
(Dave Morice)