terrorist group vs terrorism

terrorist group and terrorism both are nouns.

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

terrorist group (noun)	terrorism (noun)
a political movement that uses terror as a weapon to achieve its goals	the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear