dyslogia vs speech defect

dyslogia and speech defect both are nouns.

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

As nouns, speech defect is a hypernym of dyslogia; that is, speech defect 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 defect: a disorder of oral speech

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

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