life eternal vs aliveness

life eternal and aliveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
life eternal	Yes	No	No	No
aliveness	Yes	No	No	No

As nouns, aliveness is a hypernym of life eternal; that is, aliveness is a word with a broader meaning than life eternal:

Other hypernyms of life eternal include animation, life, living.

life eternal (noun)	aliveness (noun)
life without beginning or end	the property of being animated; having animal life as distinguished from plant life
	the condition of living or the state of being alive