Is the noun angel an abstract noun?

No, the noun "angel" is not an abstract noun; it is a concrete noun. Concrete nouns refer to things that can be perceived through the senses, such as physical beings or objects. In contrast, abstract nouns represent ideas, qualities, or concepts that cannot be physically perceived, like love or freedom. While angels may represent spiritual concepts, the term itself refers to a specific entity that can be imagined or visualized.