memory vs cognitive psychology

memory and cognitive psychology both are nouns.

Word	Noun	Adjective	Verb	Adverb
memory	Yes	No	No	No
cognitive psychology	Yes	No	No	No

As nouns, cognitive psychology is a hypernym of memory; that is, cognitive psychology is a word with a broader meaning than memory:

memory: the area of cognitive psychology that studies memory processes
cognitive psychology: an approach to psychology that emphasizes internal mental processes

memory (noun)	cognitive psychology (noun)
an electronic memory device	an approach to psychology that emphasizes internal mental processes
the power of retaining and recalling past experience
the cognitive processes whereby past experience is remembered
something that is remembered
the area of cognitive psychology that studies memory processes