Here's why:
* Proper nouns are names of specific people, places, or things. They are always capitalized.
* Fawn is a common noun. It refers to a young deer or a light brown color.
For example:
* Proper noun: "The Fawn Hotel" (referring to a specific hotel named Fawn)
* Common noun: "The fawn was hiding in the bushes." (referring to a young deer)