informant

noun 0.732

informer

noun 0.623

snitch

noun 0.563

undercover

noun 0.561

inside information

noun 0.554

confidante

noun 0.554

confidentiality

noun 0.550

private investigator

noun 0.544

insider

noun 0.544

intelligence asset

noun 0.531

infiltrator

noun 0.531

secret agent

noun 0.529

counterintelligence

noun 0.528

intelligence office

noun 0.528

double agent

noun 0.525

confessor

noun 0.519

stool pigeon

noun 0.519

confiding

noun 0.515

deep cover

noun 0.515

investigator

noun 0.508

intelligence community

noun 0.504

plainclothesman

noun 0.503

case officer

noun 0.500