anamnesis vs retentiveness

anamnesis and retentiveness both are nouns.

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

As nouns, retentiveness is a hypernym of anamnesis; that is, retentiveness is a word with a broader meaning than anamnesis:

Other hypernyms of anamnesis include memory, retention, retentivity.

anamnesis (noun)	retentiveness (noun)
the ability to recall past occurrences	the property of retaining possessions that have been acquired
the case history of a medical patient as recalled by the patient	the power of retaining liquid
	the power of retaining and recalling past experience