aliveness vs existence

aliveness and existence both are nouns.

Word	Noun	Adjective	Verb	Adverb
aliveness	Yes	No	No	No
existence	Yes	No	No	No

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

Other hypernyms of aliveness include being, beingness, face of the earth.

aliveness (noun)	existence (noun)
the property of being animated; having animal life as distinguished from plant life	everything that exists anywhere
the condition of living or the state of being alive	the state or fact of existing