complex vs involved

complex is a noun but involved is not a noun.

Word	Noun	Adjective	Verb	Adverb
complex	Yes	Yes	No	No
involved	No	Yes	No	No

complex (noun)	involved (noun)
a whole structure (as a building) made up of interconnected or related structures
a conceptual whole made up of complicated and related parts
(psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior
a compound described in terms of the central atom to which other atoms are bound or coordinated

complex (adjective)	involved (adjective)
complicated in structure; consisting of interconnected parts	connected by participation or association or use
difficult to analyze or understand	emotionally involved
	highly complex or intricate and occasionally devious
	enveloped
	entangled or hindered as if e.g. in mire