What type of noun is earth?

"Earth" can be considered both a proper noun and a common noun, depending on the context.

Proper Noun:

* When referring to the planet we live on, "Earth" is capitalized and is a proper noun. It is a unique name for a specific entity.

* Example: "The Earth is a beautiful blue planet."

Common Noun:

* When referring to soil or land in general, "earth" is not capitalized and is a common noun. It represents a general category of things.

* Example: "The gardener added some rich earth to the flower beds."

So, the type of noun "earth" is depends on how it is used in a sentence.