The things that we can not see or touch physically, rather we can only think of them, are know Abstract Noun. These are virtual things.
Examples:
Poverty, Kindness, Darkness, Happiness, Wisdom, Sweetness etc.
Abstract noun does not have plural forms. Articles (A, An or the) are not used before abstract noun.
All actions are Abstract noun.
All science and arts are Abstract noun.
All languages are abstract noun.
All diseases are abstract noun.
Examples:
Actions: eating, weeping, drinking, sleeping, writing etc.
Science: Physics, Geometry, Chemistry, Painting (art) etc.
Languages: Japanese, Chinese, Hindi etc.
Diseases: Cholera, stomach ache, backpain etc.
