constructive vs formative

constructive is not a noun while formative is a noun.

Word	Noun	Adjective	Verb	Adverb
constructive	No	Yes	No	No
formative	Yes	Yes	No	No

constructive (noun)	formative (noun)
	minimal language unit that has a syntactic (or morphological) function

constructive (adjective)	formative (adjective)
constructing or tending to construct or improve or promote development	forming or capable of forming or molding or fashioning
emphasizing what is laudable or hopeful or to the good	capable of forming new cells and tissues