Here's why:
* Abstract nouns represent concepts, qualities, or ideas that cannot be touched or seen, like "love", "justice", or "freedom".
* Adjectives describe nouns, providing more information about them. They answer questions like "what kind?" or "which one?".
"Severe" describes the intensity or seriousness of something, like "a severe storm" or "a severe injury." It modifies the noun and doesn't represent an abstract concept on its own.