incomplete vs completeness

incomplete is not a noun while completeness is a noun.

Word	Noun	Adjective	Verb	Adverb
incomplete	No	Yes	No	No
completeness	Yes	No	No	No

incomplete (noun)	completeness (noun)
	(logic) an attribute of a logical system that is so constituted that a contradiction arises if any proposition is introduced that cannot be derived from the axioms of the system
	the state of being complete and entire; having everything that is needed

incomplete (adjective)	completeness (adjective)
not complete or total; not completed
not yet finished