Nouns denoting natural objects (not man-made)

sandbank
a submerged bank of sand near a shore or in a river; can be exposed at low tide
 
black hole
a region of space resulting from the collapse of a star; extremely high gravitational field
 
supernatant
the clear liquid that lies above a sediment or precipitate
 
gauge boson
a particle that mediates the interaction of two elementary particles
 
strand
a poetic term for a shore (as the area periodically covered and uncovered by the tides)
 
bluff
a high steep bank (usually formed by river erosion)
 
world
the 3rd planet from the sun; the planet we live on
 
Mount Sherman
a peak in the Rocky Mountains in central Colorado (14,036 feet high)
 
chasm
a deep opening in the earth's surface
 
Paulo Afonso Falls
a major waterfall in northeastern Brazil
 
Rhone River
a major French river; flows into the Mediterranean near Marseilles
 
foreland
land forming the forward margin of something
 
San Juan Hill
a hill in eastern Cuba (near Santiago de Cuba) that was captured during the Spanish-American War
 
Dhaulagiri
a mountain in the Himalayas in Nepal (26,820 feet high)
 
alp
any high mountain
 
chink
a narrow opening as e.g. between planks in a wall
 
Isere River
a river in southeastern France; a tributary of the Rhone
 
White River
a tributary of the Mississippi River that flows southeastward through northern Arkansas and southern Missouri
 
Jordan River
a river in Palestine that empties into the Dead Sea; John the Baptist baptized Jesus in the Jordan
 
Piedmont type of glacier
a type of glaciation characteristic of Alaska; large valley glaciers meet to form an almost stagnant sheet of ice
 
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