The Loch Ness Monster is said to be an existent creature.

The existence of aliens has been a topic of debate for many years.

Many different species of animals exist in the world.

There are many existing buildings in the city.

The existential crisis he experienced during his college years led him to question the very meaning of life.

Existentialism is a philosophical belief that emphasizes individual existence, freedom, and choice.

He is an existentialist philosopher.