What noun that show someone or somethings owns?

The noun that shows ownership is called a possessive noun. It typically indicates that something belongs to someone or something, often formed by adding an apostrophe and "s" (e.g., "dog's leash" indicates the leash belongs to the dog). In plural forms, it can be represented by adding just an apostrophe (e.g., "dogs' park" indicates a park belonging to multiple dogs).