important vs life-or-death

important and life-or-death both are adjectives.

Word	Noun	Adjective	Verb	Adverb
important	No	Yes	No	No
life-or-death	No	Yes	No	No

important (adjective)	life-or-death (adjective)
of great significance or value	vitally important
of extreme importance; vital to the resolution of a crisis
important in effect or meaning
having or suggesting a consciousness of high position
having authority or ascendancy or influence