unchangingness vs changelessness

unchangingness and changelessness both are nouns.

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

As nouns, unchangingness and changelessness are synonyms defined as:

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

Other synonyms of unchangingness include unchangeability, unchangeableness.

unchangingness (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