This is the 14923rd most frequent German word.
rumänische
"Rumänische" means "Romanian" (adjective) in English.
Here, 'rumänischen' is used as an adjective modifying the plural noun 'Schriftsteller', referring to persons originating from Romania and describing their nationality.
Die rumänischen Schriftsteller haben eine reiche literarische Tradition.
The Romanian writers have a rich literary tradition.
In this sentence, 'rumänischen' acts as an adjective describing the singular, masculine noun 'Freund', highlighting his Romanian nationality.
Ich habe einen rumänischen Freund, der mir viel über seine Kultur erzählt.
I have a Romanian friend who tells me a lot about his culture.
Here, 'rumänischen' modifies 'Wörtern', indicating that the words discussed come from the Romanian language, attributing a linguistic quality.