timelessness vs timeless existence

timelessness and timeless existence both are nouns.

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

As nouns, timelessness and timeless existence are synonyms defined as:

timelessness and timeless existence: a state of eternal existence believed in some religions to characterize the afterlife

Other synonyms of timelessness include eternity.

timelessness (noun)	timeless existence (noun)
The property of not being restricted to a particular time or date.	a state of eternal existence believed in some religions to characterize the afterlife
a state of eternal existence believed in some religions to characterize the afterlife