dyslexia vs learning disorder

dyslexia and learning disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
dyslexia	Yes	No	No	No
learning disorder	Yes	No	No	No

As nouns, learning disorder is a hypernym of dyslexia; that is, learning disorder is a word with a broader meaning than dyslexia:

dyslexia: impaired ability to learn to read
learning disorder: a disorder found in children of normal intelligence who have difficulties in learning specific skills

Other hypernyms of dyslexia include learning disability.

dyslexia (noun)	learning disorder (noun)
impaired ability to learn to read	a disorder found in children of normal intelligence who have difficulties in learning specific skills