timeless existence vs being

timeless existence and being both are nouns.

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

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

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

Other hypernyms of timeless existence include beingness, existence, face of the earth.

timeless existence (noun)	being (noun)
a state of eternal existence believed in some religions to characterize the afterlife	a living thing that has (or can develop) the ability to act or function independently
	the state or fact of existing