Black September vs terrorist group

Black September and terrorist group both are nouns.

Word	Noun	Adjective	Verb	Adverb
Black September	Yes	No	No	No
terrorist group	Yes	No	No	No

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