capitonym (KAP-i-toh-NIM), noun. A word that changes pronunciation and meaning when it is capitalized. As in the following poems:

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.

-- AWAD, website