Synonyms of spying in English:

spying


See US English definition of spying

See UK English definition of spying

noun

1‘he was charged with spying for a foreign power’

SYNONYMS
espionage, undercover work, cloak-and-dagger activities, surveillance, reconnaissance, intelligence, eavesdropping, cyberespionage, infiltration, counter-espionage, counter-intelligence
ninjutsu
informal bugging, wiretapping, recon