Collocations for terrorist - noun

alleged, potential, suspected
convicted, known
would-be
the recruitment of young would-be terrorists

so-called
the so-called wine terrorists of the Languedoc

domestic, foreign, international
The bomb attacks have been attributed to a group of international terrorists.

armed
suicide
fundamentalist, radical, right-wing, etc.

band, cell, faction, gang, group, network, organization, unit
camp
state
act, action, activity, atrocity, attack, bomb, bombing, campaign, explosion, incident, murder, operation, strike, violence
an increase in terrorist activity
the victim of a terrorist atrocity

threat
plot
target
Aircraft remain likely terrorist targets.

victim
charge (esp. BrE), crime, offence/offense (esp. BrE)
suspect
leader