ninja
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ninja
In modern pop culture, a figure portrayed as a masked fighter dressed in dark clothing, with special skills in espionage, sabotage, and martial arts.
In dem Film kämpft der Held gegen eine ganze Armee von Ninjas.
In the film, the hero fights against an entire army of ninjas.
You can tell from the context whether the historical figure or the modern pop-culture figure is meant. Terms like 'Film' (film), 'Spiel' (game), or 'Kostüm' (costume) point to the modern figure, while 'feudales Japan' (feudal Japan) or 'historisch' (historical) refer to the original meaning.
Mein Sohn möchte sich an Karneval als Ninja verkleiden.
My son wants to dress up as a ninja for Carnival.
In pop culture, the ninja stands for special abilities. Therefore, it is often used in comparisons to describe stealth or skill, for example 'sich bewegen wie ein Ninja' (to move like a ninja).
Er schlich wie ein Ninja durch das dunkle Haus, um niemanden zu wecken.
He crept through the dark house like a ninja so as not to wake anyone.
In the historical meaning, a ninja is not a fantasy figure, but a person with a specific function. Typical associations are therefore 'Spionage' (espionage), 'Sabotage' (sabotage), and 'Attentate' (assassinations) in the context of feudal Japan.
Die Aufgaben der historischen Ninja umfassten oft Spionage und Infiltration.
The duties of historical ninja often included espionage and infiltration.
fighter
'der Kämpfer' and 'der Ninja' can both mean a person who can fight. However, 'der Kämpfer' is a general word. It fits soldiers, boxers, or martial artists. 'der Ninja' is much more specific: it means either a historical figure from Japan or a figure from films, games, and stories, often with a mask, dark clothing, and special abilities. If you only want to say that someone fights, 'Kämpfer' is more natural. 'Ninja' fits when exactly this Japanese or pop-culture figure is meant.
Im Film schleicht der Ninja leise über das Dach und verschwindet im Dunkeln.
In the film, the ninja sneaks quietly across the roof and disappears into the darkness.
Nach dem langen Boxkampf war der Kämpfer völlig erschöpft.
After the long boxing match, the fighter was completely exhausted.