From the Latin "natus" (born):
* Natal: Relating to birth, or the place of one's birth.
* Nativity: The birth of a person, especially Jesus Christ.
* Nation: A large group of people united by common descent, history, culture, or language, inhabiting a particular country or territory.
* National: Relating to or characteristic of a nation.
* Nationality: The status of belonging to a particular nation.
* Natural: Existing in or produced by nature; not artificial or man-made.
* Nature: The phenomena of the physical world collectively, including plants, animals, the landscape, and the weather.
* Native: Born in, belonging to, or inhabiting a particular place or country.
From other Latin roots:
* Ignate: To set fire to.
* Igniter: Something that starts a fire.
* Cognate: Having a common origin.
* Innate: Existing from birth; inborn.
* Nascent: Just coming into existence; emerging.
* Renature: To restore to a natural state.
* Renaturalize: To make something natural again.
This list is not exhaustive, but it provides some examples of words that use the root "nat."