twin towers vs act of terrorism

twin towers and act of terrorism both are nouns.

Word	Noun	Adjective	Verb	Adverb
twin towers	Yes	No	No	No
act of terrorism	Yes	No	No	No

twin towers (noun)	act of terrorism (noun)
twin skyscrapers 110 stories high in New York City; built 1368 feet tall in 1970 to 1973; destroyed by a terrorist attack on September 11, 2001	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