terrorist group vs Abu Nidal Organization

terrorist group and Abu Nidal Organization both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
Abu Nidal Organization	Yes	No	No	No

terrorist group (noun)	Abu Nidal Organization (noun)
a political movement that uses terror as a weapon to achieve its goals	a Palestinian international terrorist organization that split from the PLO in 1974; has conducted terrorist attacks in 20 countries