Nouns denoting natural objects (not man-made)
- skim
- a thin layer covering the surface of a liquid
- Aquarius
- a zodiacal constellation in the southern hemisphere; between Capricornus and Pisces
- Irtish River
- an Asian river that rises in the Altai Mountains in northern China and flows generally northwest to become a tributary of the Ob River
- cutting
- a piece cut off from the main part of something
- Tigris River
- an Asian river; a tributary of the Euphrates River
- sky
- the atmosphere and outer space as viewed from the earth
- airborne transmission
- a transmission mechanism in the which the infectious agent is spread as an aerosol and usually enters a person through the respiratory tract
- Makalu
- a mountain in the Himalayas in Nepal (27,790 feet high)
- split
- a lengthwise crack in wood
- monocline
- a geological formation in which all strata are inclined in the same direction
- hanging wall
- the upper wall of an inclined fault
- Admiralty Range
- mountains in Antarctica to the north of Victoria Land
- Pecos River
- a tributary of the Rio Grande that flows southeastward from New Mexico through western Texas
- Yenisei River
- a Russian river in Siberia; rises in mountains near the Mongolian border and flows generally northward into the Kara Sea
- primary
- (astronomy) a celestial body (especially a star) relative to other objects in orbit around it
- antiquark
- the antiparticle of a quark
- Neva River
- a river in northwestern Russia flowing generally west into the Gulf of Finland
- watercourse
- a natural body of running water flowing on or under the earth
- salivary calculus
- a stone formed in the salivary gland
- weakener
- that which weakens or causes a loss of strength
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