frightening vs terrorism

frightening and terrorism both are nouns.

Word	Noun	Adjective	Verb	Adverb
frightening	Yes	Yes	No	No
terrorism	Yes	No	No	No

frightening (noun)	terrorism (noun)
the act of inspiring with fear	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

frightening (adjective)	terrorism (adjective)
causing fear or dread or terror