involution vs complexness

involution and complexness both are nouns.

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

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

Other hypernyms of involution include complexity.

involution (noun)	complexness (noun)
the action of enfolding something	the quality of being intricate and compounded
the process of raising a quantity to some assigned power
the act of sharing in the activities of a group
marked by elaborately complex detail
a long and intricate and complicated grammatical construction
reduction in size of an organ or part (as in the return of the uterus to normal size after childbirth)