
der Kampf
fight
A physical confrontation between two or more people, groups, or armies.
Nach dem Fußballspiel gab es einen Kampf zwischen den Fans.
After the soccer match, there was a fight between the fans.
fight / struggle
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fight
A physical confrontation between two or more people, groups, or armies.
Nach dem Fußballspiel gab es einen Kampf zwischen den Fans.
After the soccer match, there was a fight between the fans.

contest / struggle
A competition or effort to achieve a goal against an opponent or resistance, for example in sports or politics.
Der Kampf um die Meisterschaft war bis zum letzten Spieltag spannend.
The contest for the championship remained exciting until the final matchday.

struggle
An intense personal effort to overcome a difficulty, an illness, or a problem.
Sein Kampf gegen die Krankheit hat viele Menschen inspiriert.
His struggle against the illness inspired many people.
The noun 'der Kampf' (fight/struggle) is closely related to the verb 'kämpfen' (to fight/struggle). If you know the verb, you can easily work out the meaning of the noun.
Die Mannschaft kämpfte hart um den Sieg.
The team fought hard for the victory.
The prepositions 'gegen' (against) and 'um' (for) are very common in connection with 'Kampf' (fight/struggle). 'Kampf gegen' describes the opponent or problem, while 'Kampf um' describes the goal or prize.
Der Kampf gegen die Ungerechtigkeit vereinte viele Menschen.
The fight against injustice united many people.
In the context of competition, 'Kampf' (contest/struggle) is often combined with verbs like 'aufnehmen' (to take up), 'gewinnen' (to win), or 'verlieren' (to lose). The phrase 'den Kampf aufgeben' (to give up the fight) is also very common.
Die Opposition hat den politischen Kampf aufgenommen.
The opposition took up the political struggle.
When 'Kampf' (struggle) describes a personal effort, it is often connected with abstract concepts such as an illness, an addiction, or inner doubts.
Ihr langer Kampf gegen den Krebs war bewundernswert.
Her long struggle against cancer was admirable.
war
Krieg and Kampf can both refer to an intensive, long-lasting effort against a major problem. Krieg sounds stronger and presents the approach figuratively as a military confrontation. Kampf is less emphatic and also fits ordinary, intensive efforts against a problem.

Die Regierung verstärkt mit neuen Beratungsstellen den Kampf gegen die Drogensucht.
The government is stepping up the fight against drug addiction by opening new counseling centers.
Die Regierung erklärt den Drogenbanden mit einer großen Militäroperation den Krieg.
The government declares war on the drug gangs with a major military operation.