infiltrant
infiltrator
mole
operative
spook
sleeper agent
espiocrat
spywork
secret agentry
case officer
ghost
counterspy
antispy
spookshow
legal
stealthiness
undie
nark
snoop
snooper
espionage network
cut-out
non-official cover
spylike
cyberespionage
come in from the cold
snooping
bridge agent
spy ring
spymaster
hugger-mugger
dangle
joe
stealth
CHIS
pass through
plant
provocateur
spookspeak
coinfiltrate
alphabet
hidelings
bespy
on the Q.T.
spy
spier
cover
copper's nark
tail
illegal
shadow
shadower
jasoos
counterspying
co-spy
glowie
double agent
Stasi
spookdom
rezident
black bag operation
undercover
hidingly
peeper
spydom
espionage agent
Romeo
foreign agent
mouchard
shadowing
tradecraft
subagent
agent provocateur
MI5
gumshoe
disquisitor
spying
spycraft
MI6
sleeper
stay-behind
secret service
agent-in-place
antispying
fedpost
stalky
spookmaster
backstair
discreetly
company man
operational cell
secret agent

English words for 'An infiltrator; a spy who covertly enters a territory or organisation.'

As you may have noticed, above you will find words for "An infiltrator; a spy who covertly enters a territory or organisation.". Hover the mouse over the word you'd like to know more about to view its definition. Click search related words by phrase or description. to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.

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