memory vs retrospection

memory and retrospection both are nouns.

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

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

memory (noun)	retrospection (noun)
an electronic memory device	memory for experiences that are past
the power of retaining and recalling past experience	reference to things past
the cognitive processes whereby past experience is remembered
something that is remembered
the area of cognitive psychology that studies memory processes