Irish Republican Army vs terrorist organization

Irish Republican Army and terrorist organization both are nouns.

Word	Noun	Adjective	Verb	Adverb
Irish Republican Army	Yes	No	No	No
terrorist organization	Yes	No	No	No

Irish Republican Army (noun)	terrorist organization (noun)
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	a political movement that uses terror as a weapon to achieve its goals