Learn Danish: Elefanten er stærkere end løven. - The elephant is stronger than the lion.

Just like in English, Danish often adds a suffix to the end of a regular adjective to make it comparative. Here, you take stærk and add -ere to get stærkere.

If the nouns were plural instead of singular, would stærkere change its ending?

No, it stays exactly the same! A great thing about Danish comparative adjectives ending in -ere is that they do not change based on gender or number. It is always stærkere whether you are talking about one elephant, multiple elephants, or a neuter word.

The word end looks like an English word. Does it mean the same thing?

No, it is a false friend. In Danish, end means 'than' and is used to compare two things. When you see a comparative adjective like stærkere, you will very often see end right after it to introduce the other half of the comparison.

Why do the words for elephant and lion have -en and -n at the end?

This is a quick refresher on definite articles! Danish attaches 'the' to the end of the noun. Both elefant and løve are common gender words (en-words). To say 'the elephant', you add -en to get elefanten. Because løve already ends in an 'e', you just add -n to get løven.