memory vs mental faculty

memory and mental faculty both are nouns.

Word	Noun	Adjective	Verb	Adverb
memory	Yes	No	No	No
mental faculty	Yes	No	No	No

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

memory: the power of retaining and recalling past experience
mental faculty: one of the inherent cognitive or perceptual powers of the mind

Other hypernyms of memory include faculty, module.

memory (noun)	mental faculty (noun)
an electronic memory device	one of the inherent cognitive or perceptual powers of the mind
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