Nouns denoting natural objects (not man-made)
- lethal agent
- an agent capable of causing death
- Alpha Crucis
- the brightest star in the Southern Cross
- transmission mechanism
- any mechanism whereby an infectious agent is spread from a reservoir to a human being
- mountain peak
- the summit of a mountain
- Chukchi Peninsula
- peninsula of northeastern Siberia across the Bering Strait from northwestern Alaska
- flowage
- a body of water that has been created by deliberately flooding an area
- Gondwanaland
- a hypothetical continent that (according to plate tectonic theory) broke up later into India and Australia and Africa and South America and Antarctica
- River Styx
- (Greek mythology) a river in Hades across which Charon carried dead souls
- pool
- a small lake
- hollow
- a depression hollowed out of solid matter
- mare's tail
- a long narrow flowing cirrus cloud
- Skagerrak
- a broad strait of the North Sea between Jutland and Norway
- nubbin
- a small nub (especially an undeveloped fruit or ear of corn)
- Chattahoochee River
- a river rising in northern Georgia and flowing southwest and south to join the Flint River at the Florida border where they form the Apalachicola River
- mouth
- an opening that resembles a mouth (as of a cave or a gorge)
- Bighorn River
- a river that flows from central Wyoming to the Yellowstone River in southern Montana
- Himalaya Mountains
- a mountain range extending 1500 miles on the border between India and Tibet; this range contains the world's highest mountain
- tau-minus particle
- a lepton of very great mass
- Victoria Nyanza
- the largest lake in Africa and the 2nd largest fresh water lake in the world; a headwaters reservoir for the Nile River
- watercourse
- natural or artificial channel through which water flows
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