lifelessness vs lifeless

lifelessness is a noun but lifeless is not a noun.

Word	Noun	Adjective	Verb	Adverb
lifelessness	Yes	No	No	No
lifeless	No	Yes	No	No

lifelessness (noun)	lifeless (noun)
not having life
a state of no motion or movement

lifelessness (adjective)	lifeless (adjective)
	not having the capacity to support life
	destitute or having been emptied of life or living beings
	lacking animation or excitement or activity
	deprived of life; no longer living