terrorist group vs ABB

terrorist group and ABB both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
ABB	Yes	No	No	No

terrorist group (noun)	ABB (noun)
a political movement that uses terror as a weapon to achieve its goals	an urban hit squad and guerrilla group of the Communist Party in the Philippines; formed in the 1980s