complication vs complexness

complication and complexness both are nouns.

Word	Noun	Adjective	Verb	Adverb
complication	Yes	No	No	No
complexness	Yes	No	No	No

As nouns, complexness is a hypernym of complication; that is, complexness is a word with a broader meaning than complication:

Other hypernyms of complication include complexity.

complication (noun)	complexness (noun)
the act or process of complicating	the quality of being intricate and compounded
puzzling complexity
a development that complicates a situation
a situation or condition that is complex or confused
any disease or disorder that occurs during the course of (or because of) another disease