Here's why:
* Homonyms are words that sound the same (and often are spelled the same) but have different meanings.
* Meaning is a key component of a word's identity. Since homonyms have the same sound, they lack a unique meaning that distinguishes them from other words that sound the same.
Example:
* "See" and "Sea" sound the same but have different meanings.
Let me know if you have other questions!