absoluteness vs changelessness

absoluteness and changelessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
absoluteness	Yes	No	No	No
changelessness	Yes	No	No	No

As nouns, changelessness is a hypernym of absoluteness; that is, changelessness is a word with a broader meaning than absoluteness:

absoluteness: the quality of being absolute
changelessness: the quality of being unchangeable; having a marked tendency to remain unchanged

Other hypernyms of absoluteness include unchangeability, unchangeableness, unchangingness.

absoluteness (noun)	changelessness (noun)
the quality of being absolute	the quality of being unchangeable; having a marked tendency to remain unchanged
the quality of being complete or utter or extreme	the property of remaining unchanged