tearing vs trigger-happy

tearing is a noun but trigger-happy is not a noun.

Word	Noun	Adjective	Verb	Adverb
tearing	Yes	Yes	No	No
trigger-happy	No	Yes	No	No

As adjectives, tearing and trigger-happy are synonyms defined as:

tearing and trigger-happy: marked by extreme intensity of emotions or convictions; inclined to react violently; fervid

Other synonyms of tearing include fierce, vehement, violent.

tearing (noun)	trigger-happy (noun)
shedding tears

tearing (adjective)	trigger-happy (adjective)
marked by extreme intensity of emotions or convictions; inclined to react violently; fervid	marked by extreme intensity of emotions or convictions; inclined to react violently; fervid
	irresponsible in the use of firearms