When it doesn’t rain for a very long time and the natural supply of water becomes limited, this is known as a drought. The word "drought" is a noun in these sentences:
A drought in the Horn of Africa resulted in widespread famine* in Somalia, Ethiopia, and Kenya.
Farmers in California are having trouble growing crops because of the drought in that state.
Droughts around the world cause people to move in search of food and water.
After several years of drought, our area has received enough rain to officially declare that the drought is over.
You can also use "drought" as an adjective:
Drought restrictions were put in place to preserve water.
drought
*famine: a lack of food and water. People often die when a famine is severe.
drought