Here's why:
* Common nouns are general names for people, places, things, or ideas (e.g., dog, city, book, happiness).
* Adjectives describe nouns, giving more information about them (e.g., the *afraid* dog, the bustling *city*, the interesting *book*, *unconditional* happiness).
"Afraid" describes a feeling or state of being and modifies nouns like "person", "child", or "animal" to indicate that they are experiencing fear.