Heteronym

Two different words are heteronyms if they have different meanings and different pronunciations but share the spelling. For example the metal "lead" /ld/ and the verb "lead" /liːd/.

Wikipedia has a long list of heteronyms in Heteronym (linguistics).

Common heteronyms
Other examples
 * Noun is stressed in the first syllabe, verb is stressed in the second or in the last syllable
 * conduct, content, contrast, desert, object, present, produce, project, survey, subject, transfer, transport


 * Noun is pronounced with /s/, verb is pronouced with /z/.


 * Other

Riddle
What words change their pronunciation when capitalized?

The answer to this riddle is below.