terrorist group vs Provisional IRA

terrorist group and Provisional IRA both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
Provisional IRA	Yes	No	No	No

terrorist group (noun)	Provisional IRA (noun)
a political movement that uses terror as a weapon to achieve its goals	a militant organization of Irish nationalists who used terrorism and guerilla warfare in an effort to drive British forces from Northern Ireland and achieve a united independent Ireland