This document discusses different types of nouns:
1. Proper nouns refer to specific people, places, or things and are always capitalized. Examples include names like Ram and cities like Delhi.
2. Common nouns refer to general people, places, or things and are typically not capitalized unless starting a sentence. Examples include boy, river, and city.
3. Collective nouns refer to a group of people, animals, or things and can be either singular or plural. Examples include family, team, and gang.