remembrance vs retentivity

remembrance and retentivity both are nouns.

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

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

Other hypernyms of remembrance include memory, retention, retentiveness.

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