retentiveness vs retentive

retentiveness is a noun but retentive is not a noun.

Word	Noun	Adjective	Verb	Adverb
retentiveness	Yes	No	No	No
retentive	No	Yes	No	No

retentiveness (noun)	retentive (noun)
the property of retaining possessions that have been acquired
the power of retaining liquid
the power of retaining and recalling past experience

retentiveness (adjective)	retentive (adjective)
	good at remembering
	having the capacity to retain something
	having the power, capacity, or quality of retaining water