LATIN DICTIONARYLexicon Latīnum
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“informer” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

informer
index (general term; also before a court of justice): accusator (general term for accuser before a court of justice): delator (an informer, especially a secret informer; such as were common under the emperors): calumniator (a slanderous informer). By means of informers, per indicium: to be a common informer, delationes factitare, or accusationes exercere (to follow the profession of an informer, Tac., Hist., 2, 10, 2, and 5).

Quick answer

What is the Latin word for informer?
The usual Latin words for “informer” are index, accūsō, dēlātor; also calumnior. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.