unchangeableness vs changelessness

unchangeableness and changelessness both are nouns.

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

As nouns, unchangeableness and changelessness are synonyms defined as:

unchangeableness and changelessness: the quality of being unchangeable; having a marked tendency to remain unchanged

Other synonyms of unchangeableness include unchangeability, unchangingness.

unchangeableness (noun)	changelessness (noun)
the quality of being unchangeable; having a marked tendency to remain unchanged	the quality of being unchangeable; having a marked tendency to remain unchanged
	the property of remaining unchanged