He is highly respected in the education world.

He is deeply interested in the spiritual world.

We exist as a part of the material world.

In biology, a subkingdom is one of the large units in taxonomy.

The animal kingdom is incredibly diverse, and it is said that there are still species that have not been discovered.

The animal kingdom is known for its diversity and complexity.

He was released from the suffering of this world.

Learning about the history of the frontier is important for understanding our past.

The government declared a state of emergency to prevent the spread of the new coronavirus.

He likes to take a walk in the park at dusk.