terrorist group vs Tamil Tigers

terrorist group and Tamil Tigers both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
Tamil Tigers	Yes	No	No	No

terrorist group (noun)	Tamil Tigers (noun)
a political movement that uses terror as a weapon to achieve its goals	a terrorist organization in Sri Lanka that began in 1970 as a student protest over the limited university access for Tamil students; currently seeks to establish an independent Tamil state called Eelam; relies on guerilla strategy including terrorist tactics that target key government and military personnel