Types of nouns:
1. Common nouns refer to a general type or category: girl, park, army.
2. Proper nouns refer to a particular person, place, or thing, and always begin with a capital letter: Mary, New Delhi, India Today.
3. Collective nouns signify a number of individuals organized into one group: team, crowd, Congress.
4. Abstract Nouns refer to qualities such as honesty, truthfulness; valour, bravery, slavery, childhood.