Irish Republican Army vs terrorist act

Irish Republican Army and terrorist act both are nouns.

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

Irish Republican Army (noun)	terrorist act (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	the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear