
die Schwester
sister
A female person who has the same parents as another person.
Meine Schwester und ich verstehen uns sehr gut.
My sister and I get along very well.
sister
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sister
A female person who has the same parents as another person.
Meine Schwester und ich verstehen uns sehr gut.
My sister and I get along very well.

nurse
A common term for a nurse, that is, a female nursing professional in healthcare.
Die Schwester auf der Station hat mir den Verband gewechselt.
The nurse on the ward changed my bandage.

sister / nun
A female member of a religious community or order; a nun.
Schwester Agnes leitet den Chor im Kloster.
Sister Agnes leads the choir in the monastery.
The context shows which 'Schwester' (sister/nurse/nun) is meant. Words like 'Eltern' (parents) or 'Bruder' (brother) point to family. A medical setting ('Krankenhaus' (hospital), 'Arzt' (doctor)) refers to a nurse. Religious terms like 'Kloster' (monastery/convent) or 'Orden' (religious order) signal a nun.
Meine jüngere Schwester studiert Medizin.
My younger sister is studying medicine.
In a hospital or doctor's office, it is common to address a female nurse directly as 'Schwester' (nurse), often without knowing her name.
Schwester, könnten Sie mir bitte ein Glas Wasser bringen?
Nurse, could you please bring me a glass of water?
With nuns, 'Schwester' (Sister) is used like a title, normally followed by the person's first name. It is a respectful form of address.
Schwester Johanna leitet den Kindergarten des Ordens.
Sister Johanna runs the order's kindergarten.
nurse
In a hospital, both words can refer to a female nursing professional. Schwester is a traditional, context-dependent abbreviated term and is not unambiguous outside this context, while Krankenschwester explicitly names the profession. Use Schwester in the appropriate hospital-ward context and Krankenschwester when the job title should be clear.

Auf der Station bat ich die Schwester, den Verband zu wechseln.
On the ward, I asked the nurse to change the bandage.
Im Gespräch stellte sich die Krankenschwester als erfahrene Pflegekraft vor.
During the conversation, the nurse introduced herself as an experienced healthcare professional.