* Abstract Nouns: These nouns refer to ideas, qualities, or concepts that cannot be physically touched or seen (e.g., happiness, love, freedom).
* Compound Nouns: These are nouns formed by combining two or more words (e.g., fireplace, sunlight, post office).
While "self-esteem" is a compound noun, it does not represent an abstract concept. It refers to a specific psychological state that involves one's feelings of worthiness and self-confidence.
Here's an example to illustrate the difference:
* Abstract: Happiness is a feeling that cannot be touched.
* Concrete: Self-esteem is a feeling that is often influenced by external factors and can fluctuate over time.
Therefore, self-esteem is considered a concrete noun because it refers to a tangible feeling or state of being, even though it's a compound noun.