This is a bit of a trick question! Homographs are words that are spelled the same but have different meanings and sometimes different pronunciations.
"Curb" has multiple meanings:
* A raised edge of a sidewalk or road: This is the most common meaning.
* To restrain or control: As in, "She tried to curb her anger."
Since both of these meanings are represented by the same word, "curb" is its own homograph!