imaginative vs imaginativeness

imaginative is not a noun while imaginativeness is a noun.

Word	Noun	Adjective	Verb	Adverb
imaginative	No	Yes	No	No
imaginativeness	Yes	No	No	No

imaginative (noun)	imaginativeness (noun)
	the formation of a mental image of something that is not perceived as real and is not present to the senses

imaginative (adjective)	imaginativeness (adjective)
(used of persons or artifacts) marked by independence and creativity in thought or action