ABB vs RPA-ABB

ABB and RPA-ABB both are nouns.

Word	Noun	Adjective	Verb	Adverb
ABB	Yes	No	No	No
RPA-ABB	Yes	No	No	No

As nouns, ABB and RPA-ABB are synonyms defined as:

ABB and RPA-ABB: an urban hit squad and guerrilla group of the Communist Party in the Philippines; formed in the 1980s

Other synonyms of ABB include Alex Boncayao Brigade, Revolutionary Proletarian Army.

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