underground is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Adjective (COMPARABLE)

(not comparable) Below the ground; below the surface of the Earth.
• Synonym: subterranean, hypogean
(figurative) Hidden, furtive, secretive.
• Synonym: Thesaurus:hidden, Thesaurus:covert
(of music art etc.) Outside the mainstream, especially unofficial and hidden from the authorities.
• Synonym: unconventional, alternative

Adverb (COMPARABLE)

Below the ground.
• Synonym: below ground
Secretly.
• Synonym: clandestinely, in secret, on the quiet

Noun (COUNTABLE)

(geography) Regions beneath the surface of the earth, both natural (eg. caves) and man-made (eg. mines).
(chiefly British) Synonym: subway: a railway that is under the ground.
• London Underground
(with definite article) A movement or organisation of people who resist political convention.
• Synonym: resistance

Verb

To route electricity distribution cables underground.

underground is a Scrabble valid word

underground

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

underground is an iScramble, QuickWords valid word

underground

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• UNDERGROUNDS

Same letters minus one

• UNGROUNDED