alexia vs aphasia

alexia and aphasia both are nouns.

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

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

alexia: inability to perceive written words
aphasia: inability to use or understand language (spoken or written) because of a brain lesion

alexia (noun)	aphasia (noun)
inability to perceive written words	inability to use or understand language (spoken or written) because of a brain lesion