Here's why:
* Homograph: Words spelled the same but pronounced differently (e.g., "bow" - the weapon and "bow" - to bend). "Road" has only one pronunciation.
* Homophone: Words pronounced the same but spelled differently (e.g., "to," "too," and "two"). "Road" is a unique word.
* Homonym: Words spelled and pronounced the same but have different meanings (e.g., "bat" - the animal and "bat" - the sports equipment). While "road" can refer to different types of roads (highway, street, path), it's essentially the same concept.
Therefore, "road" is just a single word with a single meaning and pronunciation.