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Synonyms for Underground

Tube
el
electric
elevated
feeder
flier
main line
metro
monorail
rail
railroad
railway
roadbed
roadway
sidetrack
siding
streetcar line
subway
switchback
terminal
terminus
track
tram
trestle
trunk
trunk line
tube
turnout
underground

Surreptitious
backstairs
clandestine
deceitful
feline
furtive
privy
quiet
shifty
skulking
slinky
sly
sneaking
sneaky
surreptitious
undercover
underground
unobtrusive

Local
airfreight
city
confined
el
electric
flier
freighter
funicular
interurban
limited
local
metro
monorail
municipal
peculiar
precise
private
restricted
rolling stock
shuttle
special
specific
streamliner
subway
town
tram
tube
underground
village

Secret
abstruse
ambiguous
arcane
beclouded
buried
censored
cheap
classified
closed
clouded
concealed
covert
cryptic
enigmatic
equivocal
esoteric
extraterrestrial
guarded
hermetic
hidden
incommunicado
inner
latent
mysterious
obscured
occult
personal
potential
private
privy
profound
recondite
restricted
secluded
secret
sequestered
shrouded
smothered
stifled
suppressed
surreptitious
top secret
ulterior
under wraps
undercover
underground
underhanded
underlying
undisclosable
undisclosed
unearthly
unexpressed
unknown
unrevealed
unspoken
untold
unutterable
unuttered