Compound nouns: the last word decides
Warteraum der
Always In 98.9% of 6,721 common compound nouns, the article comes from the last word.
The last part decides the article: der Raum, so der Warteraum.
der Warteraum
It's der Warteraum. Warteraum is masculine, plural die Warteräume.
Warten Sie im Warteraum.
Wait in the waiting room.
Warteraum der
Always In 98.9% of 6,721 common compound nouns, the article comes from the last word.
The last part decides the article: der Raum, so der Warteraum.