* Nouns are words that name people, places, things, or ideas. This broad definition means there's huge variety in how they are formed.
* Nouns can be singular or plural. Singular nouns can end in any letter, while plural nouns often end in "s" or "es."
* Nouns can be regular or irregular. Regular nouns follow patterns for pluralization (like adding "s"), while irregular nouns have unique forms (like "child" becoming "children").
Examples:
* Ending in "s": cats, dogs, houses
* Ending in "es": boxes, buses, churches
* Ending in "y": baby, lady, country
* Ending in "x": box, fox, tax
* Ending in "ch": church, beach, couch
* Ending in "sh": dish, fish, brush
* Ending in "o": piano, radio, hero
* Ending in "e": apple, orange, table
The key is understanding the concept of a noun, not focusing on specific endings.