Nouns denoting natural objects (not man-made)

contrail
an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust
 
Merrimack River
a river that rises in south central New Hampshire and flows through Concord and Manchester into Massachusetts and empties into the Atlantic Ocean
 
Cape Sable
a promontory on the far southern part of Nova Scotia
 
Purus River
a Brazilian river; tributary of the Amazon River
 
territorial waters
the waters surrounding a nation and its territories over which that nation exercises sovereign jurisdiction
 
Strait of Hormuz
a strategically important strait linking the Persian Gulf and the Gulf of Oman
 
guyot
a seamount of volcanic origin (especially in the Pacific Ocean)
 
b-meson
exceedingly short-lived meson
 
steps
the course along which a person has walked or is walking in
 
ford
a shallow area in a stream that can be forded
 
creek bed
a channel occupied (or formerly occupied) by a stream
 
Tennessee River
a river formed by the confluence of two other rivers near Knoxville; it follows a U-shaped course to become a tributary of the Ohio River in western Kentucky
 
acicula
a needlelike part or structure of a plant or animal or crystal; as a spine or bristle or crystal
 
water
the part of the earth's surface covered with water (such as a river or lake or ocean)
 
Golfo de Campeche
a part of the Gulf of Mexico to the west of Yucatan
 
Atacama Trench
a depression in the floor of the Pacific Ocean off the coast of Chile
 
Dead Sea
a saltwater lake on the border between Israel and Jordan; its surface in 1292 feet below sea level
 
Corvus
a small quadrilateral constellation in the southern hemisphere near Virgo
 
metal filing
a fragment of metal rubbed off by the use of a file
 
urinary calculus
a calculus formed in the kidney
 
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