Common Nouns:

Concrete:

* People: teacher, student, friend, neighbor, doctor

* Places: school, park, city, beach, library

* Things: book, pen, computer, car, flower

* Animals: cat, dog, bird, fish, elephant

* Foods: apple, pizza, chocolate, coffee, bread

Collective: team, family, crowd, flock, herd

Abstract:

* Concepts: love, happiness, freedom, justice, peace

* Qualities: beauty, kindness, honesty, courage, intelligence

* States of being: sleep, health, anger, sadness, excitement

* Ideas: democracy, religion, science, philosophy, art

Abstract Nouns:

Examples of abstract nouns:

* Concepts: justice, freedom, democracy, truth, hope

* Qualities: beauty, kindness, honesty, intelligence, courage

* States of being: sleep, health, anger, sadness, excitement

* Ideas: philosophy, art, music, literature, religion

Examples of abstract nouns used in sentences:

* The justice system is flawed.

* We strive for freedom of speech.

* Democracy is a form of government.

* The artist's work is full of beauty.

* He showed great kindness to the stranger.

* Anger can be a destructive emotion.

* Music can soothe the soul.

Key features of abstract nouns:

* They represent intangible ideas, concepts, qualities, or states of being.

* They cannot be physically touched or seen.

* They are often defined by their relationship to other things.

Remember: While common nouns refer to specific things, abstract nouns refer to broader, general concepts.