Englishfor English speakers
den
Noun
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A den is a place where a wild animal lives.
The wolf went back to his den to sleep after a day of hunting.
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A den is a small cave in the side of a hill.
Co
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noun
(= cobalt)
a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
CO
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noun
(= conscientious objector)
one who refuses to serve in the armed forces on grounds of conscience
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noun
(= Colorado)
a state in west central United States in the Rocky Mountains
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noun
(= carbon monoxide)
an odorless very poisonous gas that is a product of incomplete combustion of carbon