der Kaiser
emperor
The title of the male ruler of an empire, ranking above a king.
Napoleon Bonaparte krönte sich 1804 selbst zum Kaiser der Franzosen.
Napoleon Bonaparte crowned himself Emperor of the French in 1804.

emperor / Kaiser roll
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emperor
The title of the male ruler of an empire, ranking above a king.
Napoleon Bonaparte krönte sich 1804 selbst zum Kaiser der Franzosen.
Napoleon Bonaparte crowned himself Emperor of the French in 1804.

The German word 'Kaiser' has a special history: it derives directly from the name of the Roman ruler Gaius Julius Caesar. This origin explains the title's great historical significance.
Der letzte deutsche Kaiser dankte 1918 ab.
The last German emperor abdicated in 1918.
The three meanings are clearly separated by context. If it is about history and rulers, an emperor is meant. In a sports context, it is an honorific nickname. At the bakery or at breakfast, it is a bread roll.
Karl der Große wurde im Jahr 800 zum Kaiser gekrönt.
Charlemagne was crowned emperor in the year 800.
The meaning 'bread roll' is regional. 'Der Kaiser' or 'die Kaisersemmel' is used especially in Austria and southern Germany. In other parts of Germany, other words for bread rolls are common.
In Wien isst man zum Frühstück oft eine Kaisersemmel mit Butter und Marmelade.
In Vienna, people often eat a Kaiser roll with butter and jam for breakfast.
The best-known use as a nickname is 'der Kaiser' (the Kaiser) for the German footballer Franz Beckenbauer. This name was given to him because of his elegant and commanding style of play.
Franz Beckenbauer ist als „der Kaiser“ eine Legende des deutschen Fußballs.
Franz Beckenbauer is a legend of German football as 'the Kaiser'.
king
'der König' and 'der Kaiser' can both mean a male ruler. The most important difference is rank and the type of realm: a king rules over a kingdom, while an emperor rules over an empire and traditionally ranks above a king. That is why the words can easily be confused in historical or noble titles. In a figurative sense, both can also mean a particularly strong or successful person. 'König' sounds more general, for example 'der König des Pop' (the king of pop), while 'Kaiser' often sounds like a special honorary title, especially in sports.

Der Kaiser hatte Macht über ein großes Reich mit vielen verschiedenen Gebieten.
The emperor had power over a large empire with many different territories.
Im Geschichtsbuch liest Max über einen König, der lange über sein Land regierte.
In the history book, Max reads about a king who ruled his country for a long time.