Nouns denoting natural objects (not man-made)

landfill
a low area that has been filled in
 
Great Australian Bight
a wide bay of the Indian Ocean in southern Australia; notorious for storms
 
retardant
any agent that retards or delays or hinders
 
Lake Tahoe
a lake on the border between Nevada and California to the west of Carson City; a popular resort area
 
Volga River
a Russian river; the longest river in Europe; flows into the Caspian Sea
 
discard
anything that is cast aside or discarded
 
Columbia River
a North American river; rises in southwestern Canada and flows southward across Washington to form the border between Washington and Oregon before emptying into the Pacific; known for its salmon runs in the spring
 
San Joaquin River
a river in central California that rises in the Sierra Nevada and flows northwest to form a large delta with the Sacramento River
 
drink
any large deep body of water
 
interstellar medium
interstellar space including streams of protons moving from the stars
 
Housatonic River
a river that rises in western Massachusetts and flows south through Connecticut to empty into Long Island Sound
 
Pollux
the brightest star in Gemini; close to Castor
 
Gulf of Tehuantepec
an arm of the Pacific in southern Mexico
 
Great Smoky Mountains
part of the Appalachians between North Carolina and Tennessee
 
cellular inclusion
any small intracellular body found within another (characteristic of certain diseases)
 
Saale River
a river that rises in central Germany and flows north to join the Elbe River
 
Vetluga River
a river in central Russia; flows generally southward into the Volga
 
Beaufort Sea
part of the Arctic Ocean to the northeast of Alaska
 
Vega
the brightest star in the constellation Lyra
 
hood
a protective covering that is part of a plant
 
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