secret vs underground

underground vs secret

secret and underground both are nouns.

secret and underground both are adjectives.

secret is not an adverb while underground is an adverb.

Word	Noun	Adjective	Verb	Adverb
secret	Yes	Yes	No	No
underground	Yes	Yes	No	Yes

As adjectives, secret and underground are synonyms defined as:

secret and underground: conducted with or marked by hidden aims or methods

Other synonyms of secret include clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, undercover.

secret (noun)	underground (noun)
something that baffles understanding and cannot be explained	an electric railway operating below the surface of the ground (usually in a city)
something that should remain hidden from others (especially information that is not to be passed on)	a secret group organized to overthrow a government or occupation force
information known only to a special group

secret (adjective)	underground (adjective)
the next to highest level of official classification for documents	conducted with or marked by hidden aims or methods
not open or public; kept private or not revealed	under the level of the ground
having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding
not expressed
(of information) given in confidence or in secret
not openly made known
conducted with or marked by hidden aims or methods
designed to elude detection
indulging only covertly
hidden from general view or use
communicated covertly

secret (adverb)	underground (adverb)
	beneath the surface of the earth
	in or into hiding or secret operation

Difference between secret and underground

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