/ˌspēlēˈäləjē/ (noun)

Definition

the scientific study of caves and cave systems and exploring them

Example

Speleology is scientific discipline that is concerned with all aspects of caves and cave systems. Exploration and description of caves and their features are the principal focus of speleology, but much work on the chemical solution of limestone, rates of formation of stalagmites and stalactites, the influence of groundwater and hydrologic conditions generally, and on modes of cave development has been accomplished within this discipline. Speleology requires, essentially, the application of geological and hydrological knowledge to problems associated with underground cavern systems.

Source of example: https://www.britannica.com/

Parts of speech

Noun: speleologist

Adjective: speleological

Covert 1100 Words You Need

/ˈkəʊ.vɜːt/ (adj & noun)

Adjective: secret, surreptitious, underground, clandestine, stealthy, hidden, concealed, furtive, veiled, undercover, hush-hush

Noun: undergrowth providing cover, shelter or hiding place

Born out of the ashes of World War II, the covert action arm of the Central Intelligence Agency (CIA) was created to counter the challenge posed by the Soviet Union and its allies and bolster American interests worldwide. Drawing on a wide range of activities that included propaganda, psychological warfare, political and economic operations and paramilitary action, the CIA aided wider American containment policy through the deployment of ‘democracy-propping’ operations in Western Europe. It took action to prevent developing countries that were allied to neither superpower from succumbing to Russian control and it engaged in rollback campaigns designed to weaken Moscow’s hold over its Eastern European satellites. An eclectic and well-resourced organisation, the agency also provided a substitute for overt military action when the need arose and afforded essential backup when the Cold War turned hot in Korea and Vietnam.

Source: https://www.bloomsbury.com/

Antonyms: overt, open

Adverb: covertly

Noun: covertness

Farsi: مخفى ، پنهانى ، سرى ، مخفيانه ، نهان ، راز، پناهگاه ، پوشيده ، پوشپر

Subterranean 1100 Words You Need

/ˌsʌb.tərˈeɪ.ni.ən/ (adj)

under the ground, underground, below ground level, hidden, concealed, buried, secret, clandestine, furtive, covert, arcane, surreptitious:

From cavernous underground cities and age-old subterranean passageways to secret sacred hideouts and wartime bunkers, there’s a whole host of atmospheric abandoned spaces to discover if you delve beneath the surface.

Source: https://www.msn.com

America’s cities and scenery may be spectacular, but have you ever thought about what lies beneath? From labyrinthine caves to hidden towns, a nuclear bunker and subterranean hot springs, we bring you some of the most awe-inspiring underground experiences in the USA.

Source: https://www.loveexploring.com

It is a common assumption that the subterranean chamber was intended to be the King’s burial chamber, but that it was given up during the building process. This should explain why the chamber never was “finished” and the builders never bothered to remove all the bedrock from it.

Source: http://www.nielsbjerre.dk

a subterranean river

Antonyms

open, overt, revealed

Parts of Speech

• Adv: subterraneanly

French: souterraine

Farsi: زیر زمینی

Clandestine 1100 Words You Need

/klænˈdes.tɪn/ (adj)

planned or done in secret, especially describing something that is not officially allowed, furtive, surreptitious, hidden, stealthy, covert, secret, underground, concealed, undercover, illegal:

The group held weekly clandestine meetings in a church.

He has been having a clandestine affair with his secretary for three years.

She undertook several clandestine operations for the CIA.

Antonyms

overt, revealed, public, open

Parts of Speech

• Adverb: clandestinely
• Noun: clandestineness

Beneath (adv & prep) /bɪˈniːθ/

in, at or to a lower position than somebody or something else – underneath – under – below:

At the summit of the mountain, I was able to see the entire town right beneath my feet.

Antonyms

above

Minority (adj & noun) /maɪˈnɒr.ɪ.ti/ US /-ˈnɑːr.ə.ţi/

any smaller part, portion or section within a larger group, section, sector, faction, component, subgroup, element

Adjective: sectional, marginal, underground, smaller, lesser

Only a minority of the entire students could pass the difficult math test.

Antonyms

majority

Parts of Speech

• Adjective: minor
• Adverb: minorly