This is the 735th most frequent Danish word.
regn
Rain.
Here, 'regn' is used as a noun, referring to rain as a general weather phenomenon.
Jeg elsker at lytte til regn om aftenen.
I love listening to the rain in the evening.
In this sentence, 'regne' is used as a verb, indicating the action of raining.
Det begynder at regne udenfor.
It is starting to rain outside.
Here, 'regn' is again used as a noun, referring to rain as expected weather.