memory vs reminiscence

memory and reminiscence both are nouns.

Word	Noun	Adjective	Verb	Adverb
memory	Yes	No	No	No
reminiscence	Yes	No	No	No

As nouns, reminiscence is a hyponym of memory; that is, reminiscence is a word with a more specific, narrower meaning than memory:

memory: the cognitive processes whereby past experience is remembered
reminiscence: the process of remembering (especially the process of recovering information by mental effort)

As nouns, reminiscence is a hyponym of memory; that is, reminiscence is a word with a more specific, narrower meaning than memory:

Other hyponyms of memory include recollection, engram, memory trace, confabulation, screen memory.

memory (noun)	reminiscence (noun)
an electronic memory device	the process of remembering (especially the process of recovering information by mental effort)
the power of retaining and recalling past experience	a mental impression retained and recalled from the past
the cognitive processes whereby past experience is remembered
something that is remembered
the area of cognitive psychology that studies memory processes