in·form·er

[in-fawr-mer]
noun
1.
a person who informs against another, especially for money or other reward.
2.
a person who informs or communicates information or news; informant.

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

informant, informer.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
informer (ɪnˈfɔːmə) [Click for IPA pronunciation guide]
 
n
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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00:10
Informer is always a great word to know.
So is slumgullion. Does it mean:
a fool or simpleton; ninny.
a stew of meat, vegetables, potatoes, etc.
Example sentences
There are also many informer recruits and trainees who report to intelligence
  units but are not counted as employees or officers.
Other members of the ring had murdered and dismembered a government informer.
Then she stole out after him, and concealed herself in the place where the
  informer directed her.
The eavesdropper, the spy and the informer have become a fact of life.
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