RPA-ABB vs act of terrorism

RPA-ABB and act of terrorism both are nouns.

Word	Noun	Adjective	Verb	Adverb
RPA-ABB	Yes	No	No	No
act of terrorism	Yes	No	No	No

RPA-ABB (noun)	act of terrorism (noun)
an urban hit squad and guerrilla group of the Communist Party in the Philippines; formed in the 1980s	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