Killer (philately)
WordNet

noun


(1)   Predatory black-and-white toothed whale with large dorsal fin; common in cold seas
(2)   A difficulty that is hard to deal with
"That exam was a real killer"
(3)   Someone who causes the death of a person or animal
(4)   The causal agent resulting in death
"Heart disease is the biggest killer in the United States"
 
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