
der Lebensretter
lifesaver
A person who saves another person's life in a life-threatening situation.
Der Feuerwehrmann wurde als Held und Lebensretter gefeiert.
The firefighter was celebrated as a hero and lifesaver.
lifesaver
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lifesaver
A person who saves another person's life in a life-threatening situation.
Der Feuerwehrmann wurde als Held und Lebensretter gefeiert.
The firefighter was celebrated as a hero and lifesaver.

lifesaver
Colloquially, a thing or person that gets someone out of a very difficult, unpleasant, or embarrassing situation.
Dieser Kaffee am Morgen ist mein täglicher Lebensretter.
This morning coffee is my daily lifesaver.

lifeguard
A person who monitors swimming pools or beaches professionally or as a volunteer in order to prevent drowning accidents; a lifeguard.
Der Lebensretter pfiff, als die Kinder zu weit hinausschwammen.
The lifeguard blew his whistle when the children swam too far out.
The word is a compound of 'Leben' (life) and 'Retter' (rescuer). A 'Retter' is a person who rescues someone. So a 'Lebensretter' (lifesaver) is literally a person who saves a life.
Durch die schnelle Hilfe wurde der Sanitäter zum Lebensretter.
Through his quick help, the paramedic became a lifesaver.
You can recognize the colloquial meaning by the fact that it often refers to a thing or person that helps in a situation that is not life-threatening but very unpleasant.
Danke für den Regenschirm, du bist mein Lebensretter!
Thanks for the umbrella, you're my lifesaver!
The meaning 'Rettungsschwimmer' (lifeguard) becomes clear from the context. Watch for words like 'Schwimmbad' (swimming pool), 'Strand' (beach), 'See' (lake), or 'ertrinken' (to drown).
Am Badesee passte ein Lebensretter auf die Schwimmer auf.
At the swimming lake, a lifeguard watched over the swimmers.
Using the word for help in a difficult situation is clearly colloquial. In formal texts, this metaphorical meaning would be avoided.
Diese Kopfschmerztablette ist heute mein Lebensretter.
This headache tablet is my lifesaver today.
rescuer / savior
Retter and Lebensretter can both refer to a person who frees someone from danger. Lebensretter, however, explicitly makes clear that a person’s life was in danger, whereas Retter also fits less serious emergencies. Use Lebensretter when saving a life is the focus; otherwise, use Retter.

Der Lebensretter zog den bewusstlosen Schwimmer aus dem See.
The lifesaver pulled the unconscious swimmer out of the lake.
Der Retter half dem erschöpften Wanderer aus der Schlucht.
The rescuer helped the exhausted hiker out of the ravine.