anamnesis vs retention

anamnesis and retention both are nouns.

Word	Noun	Adjective	Verb	Adverb
anamnesis	Yes	No	No	No
retention	Yes	No	No	No

As nouns, retention is a hypernym of anamnesis; that is, retention is a word with a broader meaning than anamnesis:

Other hypernyms of anamnesis include memory, retentiveness, retentivity.

anamnesis (noun)	retention (noun)
the ability to recall past occurrences	the act of retaining something
the case history of a medical patient as recalled by the patient	the power of retaining liquid
	the power of retaining and recalling past experience