polyphone

A written character or combination of characters having two or more phonetic values, such as the letter a or i in English.

A written sign capable of being read in more than one way, or standing for two or more phonetic signs.

A character or vocal sign representing more than one sound, as read, which is pronounced rēd or rĕd.

A letter, or combination of letters, that can be pronounced in two or more different ways

a letter that has two or more pronunciations