underground

As a proper noun underground

is (uk|rail transport) the london underground.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a proper noun underground

is (uk|rail transport) the london underground.

As an adjective undefined is

lacking a definition or value.

As a proper noun underground

is (uk|rail transport) the london underground.

As a verb hiding is

.

As a noun hiding is

(uncountable) a state of concealment or hiding can be (colloquial|countable) a beating or spanking.

As a verb informal

is to inform (to communicate knowledge to others).

As a proper noun underground is

(uk|rail transport) the london underground.

As an adjective natural

is that exists and evolved within the confines of an ecosystem.

As a noun natural

is .

As a proper noun underground is

(uk|rail transport) the london underground.

As adjectives the difference between underground and inground

is that underground is below the ground; below the surface of the Earth while inground is inside the ground.

As an adverb underground

is below the ground.

As a noun underground

is an underground railway.

As a verb underground

is to route electricity distribution cables underground.

As a proper noun Underground

is the London Underground.

As a noun stratosphere

is stratosphere.

As a proper noun underground is

(uk|rail transport) the london underground.

As adjectives the difference between undercover and underground

is that undercover is performed or happening in secret while underground is below the ground; below the surface of the Earth.

As nouns the difference between undercover and underground

is that undercover is a person who works undercover while underground is an underground railway.

As an adverb underground is

below the ground.

As a verb underground is

to route electricity distribution cables underground.

As a proper noun Underground is

the London Underground.

As a verb pioneering

is .

As an adjective pioneering

is involving accomplishments or activities that have not been done before, or developing or using new methods or techniques.

As a noun pioneering

is .

As a proper noun underground is

(uk|rail transport) the london underground.

As a noun soil

is (uncountable) a mixture of sand and organic material, used to support plant growth or soil can be (uncountable|euphemistic) faeces or urine etc when found on clothes or soil can be a wet or marshy place in which a boar or other such game seeks refuge when hunted.

As a verb soil

is to make dirty or soil can be to feed, as cattle or horses, in the barn or an enclosure, with fresh grass or green food cut for them, instead of sending them out to pasture; hence (such food having the effect of purging them), to purge by feeding on green food.

As a proper noun underground is

(uk|rail transport) the london underground.