amnesic aphasia vs aphasia

amnesic aphasia and aphasia both are nouns.

Word	Noun	Adjective	Verb	Adverb
amnesic aphasia	Yes	No	No	No
aphasia	Yes	No	No	No

As nouns, aphasia is a hypernym of amnesic aphasia; that is, aphasia is a word with a broader meaning than amnesic aphasia:

amnesic aphasia: inability to name objects or to recognize written or spoken names of objects
aphasia: inability to use or understand language (spoken or written) because of a brain lesion

amnesic aphasia (noun)	aphasia (noun)
inability to name objects or to recognize written or spoken names of objects	inability to use or understand language (spoken or written) because of a brain lesion