causing vs trigger

causing and trigger both are nouns.

Word	Noun	Adjective	Verb	Adverb
causing	Yes	No	No	No
trigger	Yes	No	Yes	No

As nouns, trigger is a hyponym of causing; that is, trigger is a word with a more specific, narrower meaning than causing:

Other hyponyms of causing include sending, induction, initiation, coercion, compulsion, influence, inducement, inducing.

causing (noun)	trigger (noun)
the act of causing something to happen	an act that sets in motion some course of events
	lever that activates the firing mechanism of a gun
	a device that activates or releases or causes something to happen

causing (verb)	trigger (verb)
	release or pull the trigger on
	put in motion or move to act