Nouns denoting natural objects (not man-made)

bolt-hole
a hole through which an animal may bolt when pursued into its burrow or den
 
Carlsbad Caverns
a group of caverns in southeastern New Mexico noted for their stalactites and stalagmites
 
Mount Sinai
a mountain peak in the southern Sinai Peninsula (7,500 feet high); it is believed to be the peak on which Moses received the Ten Commandments
 
pinetum
an area planted with pine trees or related conifers
 
indument
a covering of fine hairs (or sometimes scales) as on a leaf or insect
 
Pyrenees
a chain of mountains between France and Spain
 
viral delivery vector
a transducing vector that uses a retrovirus
 
Isere River
a river in southeastern France; a tributary of the Rhone
 
Pavo
a small constellation near the South Pole between Tucana and Ara
 
Grand Canyon
the enormous gorge of the Colorado River in northern Arizona
 
clast
(geology) a constituent fragment of a clastic rock
 
cow dung
a piece of dried bovine dung
 
Bay of Bengal
an arm of the Indian Ocean to the east of India
 
anion
a negatively charged ion
 
Mohawk River
a river of central New York that flows southeastward to the Hudson River
 
Elbe River
a river in central Europe that arises in northwestern Czechoslovakia and flows northward through Germany to empty into the North Sea
 
Lena River
a Russian river in Siberia; flows northward into the Laptev Sea
 
backwater
a body of water that was created by a flood or tide or by being held or forced back by a dam
 
Oder River
a European river; flows into the Baltic Sea
 
Lake Keuka
a glacial lake in central New York; one of the Finger Lakes
 
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