In English, danger; Danger, adventure and harm all mean dangerous adventure. Is there a difference in usage?

Danger is a common word, which means "the present danger can also mean the future danger or not".

The patient is out of danger. The patient is out of danger.

Hazard means "unpredictable and uncontrollable danger" and means "taking a chance".

His life is full of danger. His life is full of adventure.

Risk means "taking risks" and "actively taking risks".

He risked his life to save a child.

He risked his life to save the child.

Danger is a verb.

The polluted air in the city is seriously endangering the health of residents. The polluted air in the city is seriously endangering the health of residents.