decomposable vs complex

decomposable is not a noun while complex is a noun.

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

decomposable (noun)	complex (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

decomposable (adjective)	complex (adjective)
capable of being partitioned	complicated in structure; consisting of interconnected parts
	difficult to analyze or understand