Definition - Homonyms that have the same spelling but which have different meanings and, perhaps, different pronunciations when capitalized.

Example -

(1) The proper noun Polish (as in "someone from Poland") is pronounced 'poh - lish, whereas
(2) the verb polish (as in "making something shiny") is pronounced 'pah - lish.

Etymology -
The word was probably coined by combining the word capital with the word-type suffix nym — but I have no way of proving this.

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