What is an antonym for animal kingdom?

There isn't a single perfect antonym for "animal kingdom" because it's a broad term. However, depending on the context, you could use:

Direct Opposites:

* Plant Kingdom: This is the most direct opposite, referring to the classification of all plants.

* Mineral Kingdom: This refers to the non-living, inorganic substances of the Earth.

Broader Concepts:

* Humanity: This emphasizes the human aspect of the world, contrasting with the animal kingdom.

* Non-living world: This encompasses everything that isn't alive, including minerals, elements, and even technology.

Contextual Antonyms:

* Civilization: This contrasts with the wildness often associated with the animal kingdom.

* Culture: This highlights human creations and ways of life.

The best antonym will depend on the specific meaning you want to convey.