changeless vs changelessness

changeless is not a noun while changelessness is a noun.

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

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

changeless (adjective)	changelessness (adjective)
not subject or susceptible to change or variation in form or quality or nature
unvarying in nature
remaining the same for indefinitely long times