Thank you for your responses, but, according to this (
Homonym - Wikipedia, the free encyclopedia), homonyms have the same pronounciation, different meanings.
(word close has two types of pronunciation; that is why I don't consider it a homonym)
Maybe it could be considered the heteronym, as James said. However, I don't know what shall I imagine when the word "heteronym" is pronounced. You say it is similar to homonym (to some extent.... to
what extent?) and it is a homograph as well... What is it, then?