Nouns denoting natural objects (not man-made)
- lagune
- a body of water cut off from a larger body by a reef of sand or coral
- 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
- hogback
- a narrow ridge of hills
- sea
- a division of an ocean or a large body of salt water partially enclosed by land
- full radiator
- a hypothetical object capable of absorbing all the electromagnetic radiation falling on it
- folium
- a thin layer or stratum of (especially metamorphic) rock
- Mesabi Range
- a range of hills in northeastern Minnesota where rich iron ore deposits were discovered in 1887
- achondrite
- a stony meteor lacking chondrules
- Handies Peak
- a mountain peak in the San Juan Mountains in southwestern Colorado (14,048 feet high)
- black hole
- a region of space resulting from the collapse of a star; extremely high gravitational field
- sanitary landfill
- a low area where waste is buried between layers of earth
- Niagara River
- a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York
- closed universe
- (cosmology) a universe that is spatially closed and in which there is sufficient matter to halt the expansion that began with the big bang; the visible matter is only 10 percent of the matter required for closure but there may be large amounts of dark matter
- flat
- a level tract of land
- Cape Cod Bay
- the southern part of Massachusetts Bay
- dog shit
- fecal droppings from a dog
- Spica
- the brightest star in Virgo
- Lupus
- a constellation in the southern hemisphere near Centaurus
- Labrador Sea
- an arm of the northern Atlantic between Labrador and southern Greenland
- Andromeda
- a constellation in the northern hemisphere between Cassiopeia and Pegasus; contains the Andromeda galaxy