A capitonym is a word that changes pronounciation and meaning when it's capitalized, like polish (your shoes) and Polish (from Poland). Capitonym is today's A.Word.A.Day, and Anu, the AWAD worker bee, has accompanied the daily mailing with two poems by author Richard Lederer that illustrate the concept rather well:

Job's Job
In August, an august patriarch
Was reading an ad in Reading, Mass.
Long-suffering Job secured a job
To polish piles of Polish brass.

Herb's Herbs
An herb store owner, name of Herb,
Moved to a rainier Mount Rainier.
It would have been so nice in Nice,
And even tangier in Tangier.