terrorism vs frightening

terrorism and frightening both are nouns.

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

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

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