Its two words, Under and Ground. Under being the adjective describing the location and ground being a noun for teh subject.
landforms are rocks that are underground
Underground water is called underground water, because it is "underground" not because it is fresh or salt. You can have underground salt water reservoirs just like you can have fresh water ones.
In Britain, an underground room is a cellar.
Underground springs.
the word underground is a common noun but if used like Underground Railroad then it is proper
No, the compound noun 'underground river' is a common noun, a word for any underground river anywhere. A proper noun is the name of a person, a place, a thing, or a title. The River Fleet is an underground river that runs under London, UK. The River Fleet is a proper noun.
Yes, it is, meaning underneath the surface. Underground can also be a noun.
Yes, it is a region underground. Location words are usually nouns.
Cavern. ++++ More often, just Cave - and the adjective "underground" is superfluous by noun's definition.
Yes, the noun 'tunnel' is a common noun, a general word for any underground passage.The word tunnel is also a verb: tunnel, tunnels, tunneling, tunneled.
Yes, the noun 'tunnel' is a common noun, a general word for any underground passage.The word tunnel is also a verb: tunnel, tunnels, tunneling, tunneled.
The noun 'cave' is a singular, common, concrete noun; a word for a natural underground chamber or series of chambers open to the surface; a word for a thing. The noun form of the verb to cave is the gerund, caving.
Yes, the noun 'tunnel' is a common noun, a general word for any underground passage.The word tunnel is also a verb: tunnel, tunnels, tunneling, tunneled.
The word cave can be a noun and a verb. The noun form is a large cavity formed underground. The verb form means to surrender.
The word 'then' is an adverb, an adjective and a noun. The noun 'then' is a word for a point in time, most often as the object of a preposition. The word 'tall' is an adjective and a noun. The noun 'tall' is a word for a clothing size. The word 'cave' is a verb and a noun. The noun 'cave' is a word for a naturally occurring underground hollow or passage.
The Latin equivalent of the English noun 'burrow' is cuniculus. It's a masculine gender noun. Its literal meaning is 'a rabbit, cony'. But it loosely may be translated as 'an underground passage, a mine'.