Here's why:
* Adjectives describe nouns.
* Abstract nouns represent concepts, ideas, or qualities (e.g., happiness, freedom).
* Common nouns are general names for people, places, or things (e.g., house, cat, city).
Examples:
* "The terraced gardens were beautiful." Here, "terraced" describes the gardens, which are a noun.
* "They built a terraced house." Again, "terraced" modifies the noun "house."
Let me know if you have any other words you'd like to categorize!