recollection vs retentivity

recollection and retentivity both are nouns.

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

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

Other hypernyms of recollection include memory, retention, retentiveness.

recollection (noun)	retentivity (noun)
the ability to recall past occurrences	the power of retaining liquid
the process of remembering (especially the process of recovering information by mental effort)	the property of retaining possessions that have been acquired
something recalled to the mind	the power of retaining and recalling past experience