This is the 4875th most frequent Catalan word.
terrorista
A "terrorist"; someone who uses violence and intimidation for political aims.
In this sentence, 'terrorista' functions as an adjective modifying the noun 'grup' to describe the nature of the group.
El grup terrorista va atacar la ciutat.
The terrorist group attacked the city.
Here, 'terrorista' acts as a noun referring to a singular individual involved in terrorism.
La policia va detenir un terrorista anit.
The police arrested a terrorist last night.
In this context, 'terroristes' serves as an adjective modifying the plural noun 'accions', indicating the type of actions being discussed.