This is a bit of a trick question! Homographs are words that are spelled the same but have different meanings and sometimes different pronunciations. The word "subject" has multiple meanings, including:
* A person or thing that is being discussed, described, or dealt with. (e.g., "The subject of the lecture was the history of art.")
* A person or thing that is under the authority or control of another. (e.g., "The king's subjects were loyal to him.")
* To bring under control. (e.g., "The soldiers were subject to strict discipline.")
So, while "subject" is a homograph of itself, there isn't another word that is spelled the same but has a different meaning.