terrorist act vs bombing

terrorist act and bombing both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist act	Yes	No	No	No
bombing	Yes	No	No	No

terrorist act (noun)	bombing (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	an attack by dropping bombs
	the use of bombs for sabotage; a tactic frequently used by terrorists