supergrass
/ (ˈsuːpəˌɡrɑːs) /
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noun
an informer whose information implicates a large number of people in terrorist activities or other major crimes
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Which of the following nouns has an irregular plural form?
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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How to use supergrass in a sentence
The new names were handed over by a suspect turned "supergrass".
All this is small beer compared with the supergrass that BCL Burton Copeland may turn out to be.