a person who informs against another, especially for money or other reward.
a person who informs or communicates information or news; informant.

1350–1400; Middle English; see inform1, -er1

informant, informer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
informer (ɪnˈfɔːmə)
1.  a person who informs against someone, esp a criminal
2.  a person who provides information: he was the President's financial informer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Then she stole out after him, and concealed herself in the place where the
  informer directed her.
But this the informer did not expect would be his fate.
After the filming was over, they asked me to cooperate with them as an informer.
Other members of the ring had murdered and dismembered a government informer.
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