National park and National forest

National park noun - A tract of land declared by the national government to be public property.

National forest and national park are semantically related in protected area topic. In some cases you can use "National forest" instead a noun phrase "National park".

National park and national forest are semantically related in land that is open to public topic. You can use "National park" instead a noun phrase "National forest", if it concerns topics such as natural area.