dyslogia vs speech disorder

dyslogia and speech disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
dyslogia	Yes	No	No	No
speech disorder	Yes	No	No	No

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

dyslogia: impaired ability to express ideas verbally; usually resulting from difficulties of reasoning (as in feeblemindedness or certain psychoses)
speech disorder: a disorder of oral speech

Other hypernyms of dyslogia include defect of speech, speech defect.

dyslogia (noun)	speech disorder (noun)
impaired ability to express ideas verbally; usually resulting from difficulties of reasoning (as in feeblemindedness or certain psychoses)	a disorder of oral speech