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killer
One who or that which kills.
"Carbon monoxide is a silent killer."
That which causes stress or is extremely difficult, especially that which may cause failure at a task.
"That test was a killer."
Something that is so far ahead of its competition that it effectively kills off that competition.
"Digital streaming platforms are CD killers."
Excellent, very good, cool.
"killer feature"
Causing death, destruction, or obliteration.
"killer bee"
Distressing, uncomfortable.
"I had a killer headache this morning."
A sea mammal related to dolphins and porpoises (Orcinus orca).
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