Ancient Japan was a place where beautiful nature and culture merged.

A proper noun is a noun that refers to a specific person, place, or thing.

He is an expert in entomology, especially knowledgeable about butterflies.

Insects are an important part of the natural world.

This eigenfunction is one of the fundamental concepts of quantum mechanics.

He is world-famous as an entomologist.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

Ouch, I tripped over my foot.

His opinion doesn't matter to me at all.