der Beschützer
protector
A male person who protects someone or something from danger, harm, or negative influences.
Der große Bruder sah sich als Beschützer seiner kleinen Schwester.
The big brother saw himself as the protector of his little sister.

protector
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protector
A male person who protects someone or something from danger, harm, or negative influences.
Der große Bruder sah sich als Beschützer seiner kleinen Schwester.
The big brother saw himself as the protector of his little sister.

The word is derived from the verb 'beschützen' (to protect). The ending '-er' refers to a male person who performs the action of the verb — so someone who protects.
Ein guter Bodyguard ist ein professioneller Beschützer.
A good bodyguard is a professional protector.
To say who or what is being protected, you often use the genitive or the preposition 'von' (of/from). The genitive is more formal; 'von' is more common in spoken language.
Er ist der Beschützer der Armen und Schwachen.
He is the protector of the poor and weak.
Common verbs in this context are 'sich als Beschützer fühlen' (to feel like a protector), 'sich als Beschützer aufspielen' (to act like a protector), or 'einen Beschützer brauchen' (to need a protector).
Nach dem Tod des Vaters fühlte sich der älteste Sohn als Beschützer der Familie.
After the father's death, the oldest son felt like the protector of the family.
knight
'der Ritter' and 'der Beschützer' can both have to do with protection. In stories or in a figurative sense, a knight can be someone who defends others and helps them. 'Der Beschützer' says more directly that someone protects a person or something from danger. The word is not tied to the Middle Ages and can fit many everyday situations. If the context involves castles, armor, or an honorable image, 'Ritter' fits. If only the protective function is important, 'Beschützer' is more precise.

Für seine kleine Schwester ist Tom ein ruhiger und zuverlässiger Beschützer.
For his little sister, Tom is a calm and reliable protector.
Im Märchen rettet der Ritter das Dorf vor dem Drachen.
In the fairy tale, the knight saves the village from the dragon.