
der Killer
killer
A person who kills someone, especially a contract killer.
Im Film wird ein ehemaliger Agent von einem unbekannten Killer gejagt.
In the film, a former agent is hunted by an unknown killer.
killer
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killer
A person who kills someone, especially a contract killer.
Im Film wird ein ehemaliger Agent von einem unbekannten Killer gejagt.
In the film, a former agent is hunted by an unknown killer.

killer
Colloquial for something that is extremely good, effective, or impressive.
Das Gitarrensolo in diesem Song ist der absolute Killer!
The guitar solo in this song is an absolute killer!

killer
Colloquial for something that ruins, ends, or seriously harms something else.
Der ständige Lärm war der Killer für jede Konzentration.
The constant noise was the killer for any concentration.
The original meaning 'Mörder' (murderer) is literal. The meanings 'etwas Tolles' (something great) or 'etwas Störendes' (something disruptive), on the other hand, are colloquial and are used only in informal conversations.
Die Polizei sucht nach einem professionellen Killer.
The police are looking for a professional killer.
In the meaning 'Mörder' (murderer), 'Killer' (killer) is often used as part of compound words to specify the type of killing, for example 'Auftragskiller' (contract killer) or 'Serienkiller' (serial killer).
Der Roman handelt von der Jagd auf einen gerissenen Serienkiller.
The novel is about the hunt for a cunning serial killer.
When 'Killer' (killer) describes something very good or impressive, it is a strongly colloquial expression often used by younger people. It expresses extreme enthusiasm.
Das Konzert gestern war der Killer!
The concert yesterday was a killer!
In the meaning 'etwas, das stört' (something that disrupts), 'Killer' (killer) is often used with the preposition 'für' (for) and a noun in the accusative. This construction describes exactly what is being prevented or destroyed.
Ständige Unterbrechungen sind der Killer für kreatives Arbeiten.
Constant interruptions are the killer for creative work.
murderer
Mörder and Killer can both refer to a person who has killed someone. Mörder is the neutral, general term. Killer usually sounds more colloquial and can suggest a deliberate or professional perpetrator in particular, so it is not equally suitable in every situation.

Im Film verfolgt ein Killer den Politiker durch die leeren Straßen.
In the film, a killer pursues the politician through the empty streets.
Die Polizei nahm den Mörder des Mannes noch am selben Abend fest.
The police arrested the man's murderer that same evening.