Learn German: Die Macht der neuen Regierung ist größer. - The power of the new government is greater.

The phrase der neuen Regierung is in the genitive case, which shows possession (of the new government). Because Regierung is a feminine noun, its definite article die changes to der in the genitive case. Following a definite article in the genitive, adjectives always take an -en ending, which gives us neuen.

Wait, isn't der a masculine article? Why is it used with the feminine noun Regierung?

It is easy to mix these up! While der is the standard masculine article in the nominative case (like der Hund), it is also the article for all feminine nouns in both the dative and genitive cases. Here, it simply shows that the feminine noun is in the genitive case.

Why does größer have an umlaut when the basic word is groß?

Many short, one-syllable adjectives with the vowels a, o, or u add an umlaut when they change into their comparative form. This is why groß (great or big) becomes größer (greater or bigger).

Is there a reliable way to remember the gender of Regierung?

Yes! In German, almost every single noun that ends in the suffix -ung is feminine. Learning this rule saves you from having to memorize the gender of hundreds of words individually.