completeness vs incomplete

completeness is a noun but incomplete is not a noun.

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

completeness (noun)	incomplete (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

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