remembrance vs retentiveness

remembrance and retentiveness both are nouns.

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

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

Other hypernyms of remembrance include memory, retention, retentivity.

remembrance (noun)	retentiveness (noun)
the ability to recall past occurrences	the property of retaining possessions that have been acquired
a recognition of meritorious service	the power of retaining liquid
	the power of retaining and recalling past experience