terrorist group vs Khmer Rouge

terrorist group and Khmer Rouge both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
Khmer Rouge	Yes	No	No	No

terrorist group (noun)	Khmer Rouge (noun)
a political movement that uses terror as a weapon to achieve its goals	a communist organization formed in Cambodia in 1970; became a terrorist organization in 1975 when it captured Phnom Penh and created a government that killed an estimated three million people; was defeated by Vietnamese troops but remained active until 1999