No rule for this one
No ending or word group predicts the article of Herd. Learn it as a pair and say it out loud: der Herd.
der Herd
It's der Herd. Herd is masculine, plural die Herde.
Der Herd ist gasbetrieben.
The stove runs on gas.
No ending or word group predicts the article of Herd. Learn it as a pair and say it out loud: der Herd.