This is the 10530th most frequent Spanish word.
coruñés
A person or thing from or related to A Coruña, a city in Galicia, Spain.
In this sentence, 'coruñés' is used as an adjective to describe that the writer originates from or is associated with the region of Coruña.
El escritor coruñés presentó su último libro en la feria cultural.
The writer from Coruña presented his latest book at the cultural fair.
Here, 'coruñeses' is the plural form of a noun referring to individuals from Coruña.
Los coruñeses celebran grandes festividades en el verano.
The people from Coruña celebrate large festivities in the summer.
In this case, 'coruñesa' is used as an adjective agreeing in gender and number with the noun it modifies, indicating its relation to Coruña.