die Gastgeberin
hostess
A woman who receives and entertains guests in her home or at an event.
Die Gastgeberin begrüßte jeden Gast persönlich an der Tür.
The hostess greeted every guest personally at the door.

hostess / host
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hostess
A woman who receives and entertains guests in her home or at an event.
Die Gastgeberin begrüßte jeden Gast persönlich an der Tür.
The hostess greeted every guest personally at the door.

The word is made up of 'Gast' (guest) and 'geben' (to give). A 'Gastgeberin' (hostess) is therefore literally a woman who gives something to her guests, for example food, drinks, or accommodation. The ending '-in' marks the feminine form.
Unsere Gastgeberin hat ein wunderbares Abendessen für uns gekocht.
Our hostess cooked a wonderful dinner for us.
This word belongs to a family of words around the topic of hospitality. Related words are 'der Gast' (the guest, the person being received) and 'der Gastgeber' (the masculine form, host).
Als guter Gast sollte man sich bei der Gastgeberin für die Einladung bedanken.
As a good guest, you should thank the hostess for the invitation.
Common expressions are 'eine gute Gastgeberin sein' (to be a good hostess), 'die Gäste begrüßen' (to greet the guests), or 'sich bei der Gastgeberin bedanken' (to thank the hostess).
Sie ist bekannt dafür, eine ausgezeichnete Gastgeberin zu sein.
She is known for being an excellent hostess.
In this figurative meaning, the 'Gast' (guest) is not a person, but a major event. The 'Gastgeberin' (host) is then the city, region, or country where the event takes place.
München war 1972 die Gastgeberin der Olympischen Sommerspiele.
Munich was the host of the 1972 Summer Olympics.
guest
'der Gast' and 'die Gastgeberin' belong to the same situation, but they have opposite roles. The guest is invited, comes to visit, and is provided with hospitality. The hostess receives the guests and takes care of them. The words can be confused because both are important at a celebration, a meal, or an event. The simple guide is: the guest comes; the hostess invites and receives people.

Die Gastgeberin begrüßte alle an der Tür und zeigte ihnen den Garten.
The hostess greeted everyone at the door and showed them the garden.
Beim Abendessen fragte der Gast höflich nach einem Glas Wasser.
At dinner, the guest politely asked for a glass of water.