timelessness vs existence

timelessness and existence both are nouns.

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

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

timelessness: a state of eternal existence believed in some religions to characterize the afterlife
existence: the state or fact of existing

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

timelessness (noun)	existence (noun)
The property of not being restricted to a particular time or date.	everything that exists anywhere
a state of eternal existence believed in some religions to characterize the afterlife	the state or fact of existing