
die Geburtstagsparty
birthday party
A celebration or party held for a person's birthday.
Am Samstag schmeißt meine beste Freundin eine große Geburtstagsparty.
On Saturday, my best friend is throwing a big birthday party.
birthday party
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birthday party
A celebration or party held for a person's birthday.
Am Samstag schmeißt meine beste Freundin eine große Geburtstagsparty.
On Saturday, my best friend is throwing a big birthday party.
This word is a clear example of German compounds. It consists of 'Geburtstag' (birthday) and 'Party' (party). 'Geburtstag' itself is made up of 'Geburt' (birth) and 'Tag' (day). So the meaning is literally: a party on the day of birth.
Meine kleine Schwester plant ihre Geburtstagsparty schon seit Monaten.
My little sister has been planning her birthday party for months.
To express that you are hosting a birthday party, you use the verbs 'geben' (to give/host), 'machen' (to make/do), or colloquially 'schmeißen' (to throw).
Nächstes Jahr zu meinem Dreißigsten gebe ich eine richtig große Geburtstagsparty.
Next year, for my thirtieth, I'm hosting a really big birthday party.
When inviting someone or going to a celebration, the correct preposition is 'zu' (to). You go 'zu einer Geburtstagsparty' (to a birthday party) and invite someone 'zur Geburtstagsparty' (to the birthday party).
Bist du auch zu Leos Geburtstagsparty am Freitag eingeladen?
Are you invited to Leo's birthday party on Friday too?
birthday party
Geburtstagsfeier and Geburtstagsparty can refer to the same event. Geburtstagsfeier is the neutral term for any organized celebration of a birthday. Geburtstagsparty emphasizes the more informal party atmosphere and is especially suitable when there is music, dancing, and a lively mood.

Lea plant eine ausgelassene Geburtstagsparty mit Musik und Tanz.
Lea is planning a lively birthday party with music and dancing.
Lea plant eine ruhige Geburtstagsfeier mit Kaffee und Kuchen.
Lea is planning a quiet birthday celebration with coffee and cake.