terrorist group vs Red Brigades

terrorist group and Red Brigades both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
Red Brigades	Yes	No	No	No

terrorist group (noun)	Red Brigades (noun)
a political movement that uses terror as a weapon to achieve its goals	a Marxist-Leninist terrorist organization that arose out of a student protest movement in the late 1960s; wants to separate Italy from NATO and advocates violence in the service of class warfare and revolution; mostly inactive since 1989