This is the 6027th most frequent German word.
cloppenburg
"Cloppenburg" is not a word with a standalone definition in German; it is the name of a town in Lower Saxony, Germany.
Here, 'Cloppenburg' is used as a proper noun referring to a town in Germany.
Ich fahre morgen nach Cloppenburg.
I'm traveling to Cloppenburg tomorrow.
In this context, 'Cloppenburg' is again a proper noun, serving as the subject of the sentence to denote the town.
Cloppenburg ist eine schöne Stadt mit vielen Sehenswürdigkeiten.
Cloppenburg is a beautiful city with many attractions.
'Cloppenburger' acts as an attributive adjective derived from the proper noun 'Cloppenburg', indicating origin or association.